seamus dubhghaill

Promoting Irish Culture and History from Little Rock, Arkansas, USA


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The 1918 Irish General Election & Rise of Sinn Féin

The 1918 Irish general election is the part of the 1918 United Kingdom general election which takes place in Ireland on December 14, 1918. It is a key moment in modern Irish history because it sees the overwhelming defeat of the moderate nationalist Irish Parliamentary Party (IPP), which had dominated the Irish political landscape since the 1880s, and a landslide victory for Sinn Féin. Sinn Féin had never previously stood in a general election but had won six seats in by-elections in 1917–18. The party vows in its manifesto to establish an independent Irish Republic. In Ulster, however, the Irish Unionist Alliance (IUA) is the most successful party.

In 1918, a system called plural voting is in place in both Britain and Ireland. Plural voting is a practice whereby one person might be able to vote multiple times in an election. Property and business owners can vote both in the constituency where their property lay and that in which they live, if the two are different. In the newly formed Irish Free State this system is ended by the Electoral Act 1923 and is abolished in the United Kingdom by the Representation of the People Act 1948. Plural voting remains in effect in Northern Ireland until 1969.

The 1918 election is held in the aftermath of World War I, the Easter Rising and the Conscription Crisis. It is the first general election to be held after the Representation of the People Act 1918. It is thus the first election in which women over the age of 30, and all men over the age of 21, can vote.

Sinn Féin is founded by Arthur Griffith in 1905. He believes that Irish nationalists should emulate the Ausgleich of Hungarian nationalists who, in the 19th century under Ferenc Deák, had chosen to boycott the imperial parliament in Vienna and unilaterally establish their own legislature in Budapest.

Griffith initially favours a peaceful solution based on “dual monarchy” with Britain, that is two separate states with a single head of state and a limited central government to control matters of common concern only. However, by 1918, under its new leader, Éamon de Valera, Sinn Féin has come to favour achieving separation from Britain by means of an armed uprising if necessary and the establishment of an independent republic.

In the aftermath of the 1916 Easter Rising, the party’s ranks are swelled by participants and supporters of the rebellion as they are freed from British gaols and internment camps. At its 1917 Ardfheis (annual conference) de Valera is elected leader, and the new, more radical policy is adopted.

Prior to 1916, Sinn Féin had been a fringe movement having a limited cooperative alliance with William O’Brien‘s All-for-Ireland League and enjoyed little electoral success. However, between the Easter Rising of that year and the 1918 general election, the party’s popularity increases dramatically. This is due to the failure to have the Home Rule Bill implemented when the IPP resists the partition of Ireland demanded by Ulster Unionists in 1914, 1916 and 1917, but also popular antagonism towards the British authorities created by the execution of most of the leaders of the 1916 rebels and by their botched attempt to introduce Home Rule on the conclusion of the Irish Convention linked with military conscription in Ireland (see Conscription Crisis of 1918).

Sinn Féin demonstrates its new electoral capability in four by-election successes in 1917 in which George Noble Plunkett, Joseph McGuinness, de Valera and W. T. Cosgrave are each elected, although it loses three by-elections in early 1918 before winning two more with Patrick McCartan and Arthur Griffith. In one case there are unproven allegations of electoral fraud. The party benefits from a number of factors in the 1918 elections, including demographic changes and political factors.

In the aftermath of the elections, Sinn Féin’s elected members refuse to attend the British Parliament in Westminster, and instead form a parliament in Dublin, Dáil Éireann (“Assembly of Ireland”), which declares Irish independence as a republic. The Irish War of Independence is conducted under this revolutionary government which seeks international recognition and sets about the process of state-building. The next election is part of 1921 Irish elections.

(Pictured: L to R, Éamon de Valera of Sinn Féin, Sir Edward Carson on the Irish Unionist Alliance, and John Dillon of the Irish Parliamentary Party)


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Birth of Con Collins, Sinn Féin Politician

Cornelius Collins (Irish: Conchobhar Ó Coileáin), Irish Sinn Féin politician known as Con Collins, is born in Arranagh, Monagea, Newcastle West, County Limerick, on November 13, 1881.

Collins has joined the Gaelic League by 1910 when working in London for the civil service, as had Michael Collins the previous year. He is a member of the Irish Volunteers and the Irish Republican Brotherhood (IRB). He and Austin Stack are on their way to meet Sir Roger Casement at Banna Strand in County Kerry in 1916 during a failed attempt to land arms for Irish Republicans from the German vessel Aud, when they are arrested by the British authorities on Easter Saturday. They spend Easter Week in Tralee Barracks and in solitary confinement on Spike Island, County Cork. They are then held with Terence MacSwiney, Arthur Griffith and others in Richmond Barracks before being sentenced to penal servitude for life. He is deported to Frongoch internment camp in Wales where he spends the rest of the year and much of 1917.

Collins is elected as a Sinn Féin MP for West Limerick at the 1918 Irish general election. In January 1919, Sinn Féin MPs who had been elected in the Westminster elections of 1918 refuse to recognise the Parliament of the United Kingdom and instead assemble at the Mansion House in Dublin as a revolutionary parliament called Dáil Éireann. At the 1921 Irish elections he is elected for the constituency of Kerry–Limerick West. He opposes the Anglo-Irish Treaty and votes against it.

Collins refuses an offer of the Ministry for Posts and Telegraphs provided he switch to the pro-Treaty side. Having been sworn to non-violence – together with Richard Mulcahy – by the Augustinians, he does not join the anti-Treaty forces. He is again re-elected for Kerry–Limerick West at the 1922 Irish general election, this time as anti-Treaty Sinn Féin Teachta Dála (TD). He does not contest the 1923 Irish general election and retires from politics.

Collins dies in Dublin on November 23, 1937, at the age of 56, and is buried in Mount St. Lawrence cemetery, Limerick.

He and Piaras Béaslaí share a distinction in that they contest and are elected in three Irish general elections unopposed by any other candidates.

(Pictured: Wedding photo of Sinn Féin politician Con Collins, September 12, 1923)


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First Edition of the “Irish Bulletin” is Produced

First edition of the Irish Bulletin, the official gazette of the government of the Irish Republic, is produced by Dáil Éireann’s Department of Propaganda on November 11, 1919, during the Irish War of Independence. The Irish Bulletin appears in weekly editions until July 11, 1921, and becomes very important in getting the Irish side of events known to a wide audience.

In April 1919, Terence MacSwiney proposes the establishment of a daily paper by the Dáil for the purpose of publicity. His suggestion is not implemented until November, when Desmond FitzGerald decides that some form of printed counterpropaganda is vital to republican aims and to take advantage of the success of Sinn Féin and the increasing international interest in Ireland. Fitzgerald succeeds Laurence Ginnell in the Ministry following the latter’s arrest in April 1919, though he does not take up the position until July. At a Cabinet meeting held on November 7, there is agreement that there should be “A scheme for daily news bulletin to foreign correspondents, weekly lists of atrocities; entertainment of friendly journalists approved, and £500 voted for expenses under Mr. Griffith’s personal supervision.” Four days later the Irish Bulletin makes its debut, in a run consisting of just thirty copies. Five issues of the bulletin are issued each week for the next two years, despite efforts by the British authorities to suppress it.

The Irish Bulletin‘s offices are originally located at No. 6 Harcourt Street, Dublin. FitzGerald is the paper’s first editor, until his arrest and replacement by Erskine Childers. In the early days, the paper is produced mainly by Frank Gallagher and Robert Brennan. Brennan, as Sinn Féin’s Director of Publicity since April 1918, had played a leading role in that party’s success in the 1918 Irish General Election.

Following FitzGerald’s arrest in 1921, Childers is appointed Director of Propaganda taking charge of publicity and thus becoming the paper’s new editor. On May 9, 1921, both Childers and Gallagher are arrested and taken to Dublin Castle. Following the intervention of Sir Alfred Cope, both are released that night and go on the run. The hasty release of the two leads to speculation between Art O’Brien and Michael Collins that there is a rift developing between the British military authorities and the civil administration. Despite the arrests, the Irish Bulletin continues to appear on schedule. Alan J. Ellis, a journalist with The Cork Examiner makes occasional contributions to the paper. Kathleen Napoli McKenna is “a key force behind the daily newssheet.”

In the early days, the Irish Bulletin consists mainly of lists of raids by the security forces and the arrests of suspects. In order to stimulate interest, this is expanded in 1921 at the behest of the Irish President, Éamon de Valera, in his direction to Childers to give more detailed accounts of events. Extracts from foreign publications, particularly sympathetic English papers, are frequently included. A regular feature is accounts from the Dáil Courts, which are reported in detail.

The Irish Bulletin is more graphic in its coverage of violence than is usual for its time. An example is its reporting on the deaths of two prominent Sinn Féin leaders, Henry and Patrick Loughnane, from Shanaglish, Gort, County Galway. The men had been handed over by the Royal Irish Constabulary (RIC) to local members of the Auxiliary Division. On December 6, the bodies are found in a pond. The skulls had been battered in and the flesh was hanging loose on both bodies.The two men were evidently tied by the neck to a motor lorry and dragged behind it until they were dead. Before the bodies were hidden in a pond an effort was made to burn them.

On the night of March 26-27, 1921, the offices of the Irish Bulletin are discovered by the British authorities. Captured typewriters and duplicators are used to fabricate bogus issues of the paper. These are distributed to the usual subscribers using lists found at the office. Lord Henry Cavendish-Bentinck MP on receiving some of the counterfeit papers through the post, asks in the House that those responsible “not (to) waste their money in sending me any more of their forgeries.” The initial efforts of the forgers, Captains Hugh Pollard and William Darling, are of poor quality and easily identified as counterfeit.

(Pictured: The “Irish Bulletin” issue of October 12, 1920, National Museum of Ireland)


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Killing of Frank Brooke, Director of Dublin and South Eastern Railways

Francis Theophilius “Frank” Brooke PC, JP, DL, Anglo-Irish Director of Dublin and South Eastern Railway and a member of the Earl of Ypres‘ Advisory Council, is killed allegedly by the Irish Republican Army (IRA) in his Dublin office on July 30, 1920.

Brooke is a cousin of Sir Basil Brooke, the future Prime Minister of Northern Ireland (1943-63) who is later created, in 1952, the 1st Viscount Brookeborough.

Brooke is also Deputy Lieutenant of County Wicklow and County Fermanagh, a Lieutenant in the Royal Navy, a Justice of the Peace for County Fermanagh and an Irish Privy Counsellor (1918), thus he is styled The Right Honourable Francis Brooke.

In July 1912 Brooke attends a house party at Wentworth Woodhouse hosted for George V‘s stay there.

On July 30, 1920, Brooke is killed, at the age of 69, at his offices in Dublin, by Paddy Daly, Tom Keogh and Jim Slattery, members of Michael Collins‘s Squad of the Irish Republican Army (IRA). He is killed in view of a colleague, who is spared. He is marked out for his activities as a judge, anti-republican activities, and his friendship with Sir John French. As an Irish Privy Counsellor, he is a signatory of the order proclaiming Dáil Éireann illegal.

The inquest following the assassination finds that Brooke had a pistol in his jacket pocket. His killing has been termed the only outright political assassination of the Irish War of Independence.

(Photo credit: Kevin Lee)


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Birth of Harry Boland, Politician & President of the Irish Republican Brotherhood

Harry Boland, Irish republican politician who serves as President of the Irish Republican Brotherhood (IRB) from 1919 to 1920, is born at 6 Dalymount Terrace, Phibsborough, Dublin, on April 27, 1887. He serves as a Teachta Dála (TD) from 1918 to 1922.

Boland is the son of Irish Republican Brotherhood member James Boland and Kate Woods. He was active in GAA circles in early life, and referees the 1914 All-Ireland Senior Football Championship Final. He joins the IRB at the same time as his older brother Gerald in 1904, following in the footsteps of his father, uncle and probably grandfather. He is educated at the Synge Street CBS, but hads a personality clash with one of the brothers so he refuses to carry on his attendance at the school. He then goes to De la Salle College, County Laois, as a novice.

Boland later joins the Irish Volunteers along with Gerry and his younger brother Ned. They take an active part in the Easter Rising of 1916.

At the 1918 Irish general election, Boland is elected as an MP for South Roscommon. In line with all the Sinn Féin MPs elected at that election, he does not take his seat in the British House of Commons but withdraws to sit in the declared independent Dáil Éireann (the First Dáil) and is named by Éamon de Valera as special envoy to the United States, a role his uncle Jack had played 25 years earlier. He leaves Ireland for the United States along with de Valera as part of a campaign to raise awareness and support for their cause in America. He negotiates a loan of $20,000 from the Irish Republic to the Russian Soviet Federative Socialist Republic through the head of the Soviet Bureau, Ludwig Martens, using some Russian jewelry as collateral. These jewels are transferred to Ireland when he returns. His sister Kathleen and her mother are entrusted with the safekeeping of jewels.

During the Irish War of Independence (1919-21), Boland operates alongside Michael Collins, who is a close friend.

At the 1921 Irish elections, Boland is elected to the Second Dáil as one of the TDs for the Mayo South–Roscommon South. He opposes the Anglo-Irish Treaty. In the ensuing Irish Civil War (1922-23), he sides with the Anti-Treaty Irish Republican Army.

In the 1922 Irish general election, Boland is re-elected to the Dáil representing Mayo South–Roscommon South. Six weeks later, on July 31, he is shot by soldiers of the National Army when they attempt to arrest him at the Skerries Grand Hotel. Two officers enter his room and, although unarmed, he is shot and mortally wounded during a struggle.

The following day, August 1, 1922, Boland dies in St. Vincent’s Hospital in Dublin. As he lay dying, he refuses to give the name of his attacker to his sister, Kathleen. He is buried at Glasnevin Cemetery. The service takes place from the Whitefriar Street Carmelite Church. The hearse is followed by Cumann na mBan, Clan na Gael and the Irish Citizen Army women’s section.

Boland’s death affects Collins and possibly spurs him toward peace negotiations with Éamon de Valera.

Boland’s brother, Gerald Boland, is a prominent member of Fianna Fáil and later serves as Minister for Justice. His nephew, Kevin Boland, serves as a Minister until he resigns in solidarity with the two ministers, Charles Haughey and Neil Blaney, who are sacked from the government in May 1970 during the Arms Crisis. Kevin Boland’s resignation from Fianna Fáil and the subsequent loss of his seat marks the end of an era for the Boland political dynasty.

Boland’s nephew, Harry Boland, is a basketball player who competes in the 1948 Summer Olympics in London. He dies on December 18, 2013, at the age of 88.

In the 1991 TV movie The Treaty, Boland is portrayed by Malcolm Douglas. In the 1996 film Michael Collins, he is portrayed by American actor Aidan Quinn. The film is criticised for fictionalising both Boland’s death and Collins’ life.


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Death of Liam Lynch, Chief of Staff of the Irish Republican Army

Liam Lynch, Chief of Staff of the Irish Republican Army (IRA), is mortally wounded by Irish Free State troops in County Tipperary on April 10, 1923, as they try to avoid capture. He is transported to St. Joseph’s Hospital in Clonmel but dies there that night.

Lynch is born on November 9, 1893, in Barnagurraha, Anglesboro, County Limerick, the fifth child among six sons and a daughter of Jeremiah Lynch, farmer, and Mary Lynch (neé Kelly). The family is politically active. His father’s brother, John, had taken part in the Fenian Rising of 1867 and his mother had been joint secretary of the Ballylanders branch of the Ladies’ Land League.

Lynch attends Anglesboro national school (1898–1909). In 1910 he moves to Mitchelstown, County Cork, to take up a three-year apprenticeship in the hardware store of P. O’Neill on Baldwin Street. He remains there until the autumn of 1915. While in Mitchelstown he is a member of the Gaelic League and the Ancient Order of Hibernians. He also joins the Irish Volunteers. In 1914, when that organisation splits, he does not immediately join the militant rump. He then moves to Fermoy, County Cork, where he works in the store of Messrs J. Barry & Sons Ltd. His move coincides with a period of inactivity as neither Volunteer faction is very active nor is he known. Consequently, he does not take part in the 1916 Easter Rising, but it is a turning point for him. On May 2, 1916, he watches as the Kent family are led through Fermoy, having been captured by British soldiers. Richard Kent dies from a wound sustained that day and Thomas Kent is executed a week later. Lynch becomes a committed Volunteer at this point.

Once committed, Lynch’s enthusiasm and aptitude ensures that he quickly attains positions of responsibility. From early 1917 he is first lieutenant in the small Fermoy company. In September 1917, the Irish Volunteers in east Cork are reorganised. Nine local companies are formed into the Fermoy battalion, and he is elected adjutant. In April 1918, at the height of the conscription crisis, he briefly quits his job to concentrate on organising the Volunteers. In May he is lucky to escape arrest during the sweep that accompanies the “German plot.” When the immediate danger ends, he returns to Barry & Sons.

In January 1919, at the beginning of the Irish War of Independence, the Volunteer organisation in Cork undergoes a major restructuring. Three brigades are established, and Lynch becomes brigade commandant of Cork No. 2. In April he visits Irish Republican Army GHQ in Dublin to discuss plans and to seek arms. It is a frustrating experience as the GHQ has few guns and are cautious about action. Throughout the summer of 1919 he presses GHQ to authorise attacks on British targets as a method of acquiring arms and to prevent boredom and stagnation setting in among his men. Finally, GHQ sanctions attacks if the primary aim is the capture of arms. In response, on September 7, 1919, twenty-five men from the Fermoy company, led by Lynch, ambush fourteen British soldiers on their way to service in the Wesleyan church in Fermoy. Fifteen rifles are captured, one soldier killed, and three wounded. Lynch is shot in the shoulder, probably by one of his own men. As a result, he has to leave his job and hides out in Waterford for a time. A series of arrests follow, among those is Lynch’s close friend, Michael Fitzgerald, who dies on hunger strike in Cork County Gaol in 1920.

Lynch spends the early months of 1920 at GHQ in Dublin. During this time, he is offered the position of deputy chief of staff, but turns it down, preferring to return to Cork. Although not an articulate speaker, he impresses those he meets. His organisational talents, attention to detail, ability to inspire, and intolerance for those who waste meetings endlessly discussing side issues, are noted. He has a low tolerance for politicians and at all times considers the military wing of the movement to be of primary importance. He is engaged to Bridie Keyes, but marriage is postponed pending a final settlement of hostilities.

On June 26, 1920, Lynch, Seán Moylan, and two colleagues capture Major-General Cuthbert Lucas while he is fishing on the Munster Blackwater. He gives a false name when he is arrested on August 12, 1920, at City Hall, Cork, with Terence MacSwiney, Lord Mayor of Cork, and ten others. All but MacSwiney are released four days later. He then sets about organising a flying column within the brigade. Ernie O’Malley arrives from headquarters to train the men. This column achieves a major coup on September 28, 1920, when they briefly capture the British Army barracks at Mallow, leaving with a large booty of rifles, ammunition, and two machine guns. The British respond to this increase in activity and the war settles into a pattern of ambush and counter-ambush. The Mallow battalion suffers severe losses in February 1921 and Lynch himself narrowly escapes when four are killed during an encounter at Nadd in March 1921.

In early 1921 Lynch seeks to encourage greater cooperation between the various brigades in the south. Senior brigade officers meet on three occasions to discuss cooperation and a plan to import arms from Italy. The importation project fails, but the First Southern Division is formed on April 26, 1921, bringing eight brigades from Cork, Kerry, Waterford, and west Limerick together. He is elected divisional commandant, making him the most powerful officer outside GHQ. His influence is further increased by his appointment as Southern Divisional Centre and Supreme Council member of the clandestine Irish Republican Brotherhood (IRB) in March 1921.

Lynch is wary when the truce is called in July 1921. He works hard to maintain order in his division and to achieve a state of readiness in case the negotiations fail. For him the Anglo-Irish Treaty is a failure. When the Supreme Council of the IRB meets on December 10, 1921, he is the only voice against the agreement. He is among the officers who insist that an army convention should be called to discuss the treaty, effectively asserting that the army no longer accepts a position subordinate to the Dáil. The army, he believes, is the army of the Republic, and no civilian body can order it to abandon the Republic. The provisional government tries to ban this convention, but it goes ahead on March 26, 1922, and elects an army executive. Lynch is elected Chief of Staff. Between March and June, he works hard to prevent a civil war. He believes unity can be maintained, even under the Treaty, if a republican constitution can be enacted. He also cooperates with Michael Collins in promoting Irish Republican Army (IRA) activity in Ulster. In his adherence to the idea of a republic, the practicalities of politics have little impact on his consciousness, and he is dismissive of the popular support for the Treaty. He is horrified at the thought of civil war but fails to see that his position is leading almost inexorably in that direction. Distrusted as too moderate by Liam Mellows and Rory O’Connor, he is locked out of the Four Courts for a time.

When the Four Courts are attacked, Lynch immediately leaves his headquarters at the Clarence Hotel to travel south. He is briefly detained, before reaching Kingsbridge Station, and has a meeting with Eoin O’Duffy. He is disgusted when Free State figures later claim that he was released, having promised not to take arms against the government. The most plausible explanation of the incident appears to be that O’Duffy interpreted Lynch’s comments, merely indicating disappointment that a war had started, as constituting a statement of intent not to involve himself.

Lynch’s initial actions seem designed to avoid full-scale conflict. He does not order an attack on Dublin, nor does he attempt to seize Limerick. He chooses a containment strategy, seeking to hold a line from Limerick to Waterford for the republican forces. This fails, as the government sends troops in from the rear by sea. The republicans have no urban base when Lynch abandons Fermoy on August 11, 1922. He continues to meet individuals who seek a way to end the war, but intransigence has set in and he insists that armed struggle will only end with a republic or absolute defeat. As early as August many republicans believe the war is lost and urge a reassessment of tactics, but Lynch rejects all such calls. Operating from secret headquarters in Santry, he orders the shooting of pro-Treaty politicians in retaliation for the execution of republican prisoners.

Under war conditions it is impossible for the army executive to meet regularly, and this leaves Lynch in almost complete control. As the pro-surrender lobby grows within the republican forces, he delays a meeting of the executive, claiming with some justification that it is too dangerous. He leaves Santry and attends a meeting of the Southern Division Council in the last days of February 1923. Sixteen of the eighteen officers there tell him that the military position is hopeless. This forces the calling of an executive meeting on March 6, 1923. No agreement is reached. He strongly favours fighting on, but a motion from Tom Barry, calling for an immediate end to hostilities, is barely rejected. Another meeting is arranged for April 10. On that morning a group, including Lynch and Frank Aiken, suddenly find themselves in danger of capture in a farmhouse on the slopes of the Knockmealdown Mountains in County Tipperary. They flee and are pursued. During the chase Lynch is shot in the abdomen. It seems clear that he is shot by the pursuing Free State soldiers, although Irish historian Meda Ryan has considered the theory that he may have been shot by one of his own in order to remove the major stumbling block to surrender. His colleagues are forced to abandon him, and he is captured. Initially the Free State troops believe they have caught Éamon de Valera. He is taken first to a public house in Newcastle, County Tipperary, and then to St. Joseph’s Hospital in Clonmel, but dies from his wound at 8:45 p.m. that evening. His last request is to be buried beside Michael Fitzgerald in Kilcrumper Cemetery, Fermoy, County Cork. On hearing of Lynch’s death, Ernie O’Malley writes, “You who were a living force are now a battle cry.” O’Malley is wrong, however, as the peace faction within republicanism is strengthened by his death and Aiken orders the suspension of activities on April 27.

In 1935, a massive memorial, consisting of a 60-foot-tall round tower, guarded by four bronze Irish Wolfhounds, is erected at Goatenbridge, County Tipperary, near the site of his capture. It is unveiled on April 7, 1935. Separate annual commemorations are held at Goatenbridge and Kilcrumper. Three biographies have been written and the Liam Lynch memorial pipe band is based in his native Anglesboro. The Lynch family possess a substantial collection of private correspondence.


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Birth of Diarmuid O’Hegarty, Civil Servant & Revolutionary

Diarmuid O’Hegarty (Ó hÉigeartuigh), civil servant and revolutionary, is born Jeremiah Stephen Hegarty on December 26, 1892 in Lowertown, Skibbereen, County Cork, the eldest of seven children of Jeremiah Hegarty (1856–1934) and his wife Eileen (née Barry), both teachers. He is educated at the Christian Brothers school, St. Patrick’s Place, Cork, joins the civil service in 1910 and is posted to the Department of Agriculture and Technical Instruction, acquiring invaluable administrative experience as private secretary to T. P. Gill, secretary of the department.

O’Hegarty is a member of the Keating branch of the Gaelic League and the closely associated Teeling circle of the Irish Republican Brotherhood (IRB). In 1913 he becomes secretary and stage manager of a troupe of Gaelic players, Na hAisteoirí, which includes several who later become prominent revolutionaries: Piaras Béaslaí, Gearóid O’Sullivan, Fionán Lynch, and Con Collins. As second lieutenant of F Company, 1st Battalion, Dublin Brigade, Irish Volunteers, during the Easter Rising, he is in charge of barricades in Church Street, Mary Lane, Mary’s Abbey, and Jameson Distillery, an area which sees fierce fighting. Imprisoned in Knutsford (May 1-18), he is released in error and returns to his post in the civil service. On his return he is a key figure in the reorganisation of the Volunteers and IRB, becoming a member of the executive of the IRB’s supreme council along with Michael Collins and Seán Ó Murthuile. He also becomes a central figure in Kathleen Clarke‘s prisoner support group, the Irish Volunteer Dependents Fund, and when it amalgamates with the more moderate Irish National Aid Association to form the INA&VDF in August 1916, he helps to ensure that it is dominated by republicans.

O’Hegarty is very close to Michael Collins and Harry Boland and in 1918 this IRB triumvirate exercises considerable control in the nomination of Sinn Féin candidates for the 1918 Irish general election. In the same year he is dismissed from the civil service for refusing to take the oath of allegiance, but his administrative talents find ample outlet in the secretariat of the revolutionary Dáil and later in the service of the Irish Free State to such an extent that he has been called ‘the civil servant of the revolution’ and ‘the Grey Eminence of the Free State Government.’ As clerk of the First Dáil and secretary to the Dáil cabinet (1919–21), he is largely responsible for its success, organising meetings of the clandestine parliament and coordinating the work of various departments from his offices on the corner of O’Connell Street and Abbey Street and later in Middle Abbey Street. He is determined that the Dáil will demonstrate its worth by ‘functioning as any progressive government would be expected to function.’ He records the minutes and handles all correspondence of the Dáil cabinet. As the conduit through which the Dáil’s ministers communicate, his role is central to the effective operation of government on the run. The influence this gives him within the revolutionary movement is bolstered by his senior role within the IRB and the positions of military significance which he occupies. He is a member of the Volunteer Executive (Jun 1916–Nov 1921), Irish Republican Army (IRA) Director of Communications (Jul 1918–Mar 1920), and Director of Organisation (Mar 1920–Apr 1921). When convicted of illegal assembly and jailed in Mountjoy Prison (Nov 1919–Feb 1920), he immediately wields power within the prison, ordering Noel Lemass off a hunger strike.

O’Hegarty resigns his military duties in April 1921 to concentrate on his work in the Dáil secretariat and serves as secretary to the Irish delegation during the Anglo–Irish Treaty negotiations in London (Oct–Dec 1921). He is a vital voice for the Treaty within the IRB and is appointed secretary to the cabinet of the Provisional Government in 1922, participating in the unsuccessful army unification talks of May 1922. During the Irish Civil War he is briefly seconded from his civil service post to serve as military governor of Mountjoy Prison (Jul-Aug 1922), where he threatens that prisoners who persist in leaning out of windows and talking to the public outside the prison will be shot. Peadar O’Donnell, who is a prisoner there at the time, remembers him as the focus of much ‘republican bitterness.’ A member of the army council during the Irish Civil War, he serves as Director of Organisation (Jul–Dec 1922) and Director of Intelligence (Dec 1922–May 1923), leaving the army with the rank of lieutenant general on May 1, 1923 to resume his civil service career.

O’Hegarty is secretary to the Executive Council of the Irish Free State (1923–32) and principal private secretary to its president, W. T. Cosgrave. Again he records the cabinet minutes and is the administrative pivot upon which government turns. He serves as secretary to numerous governmental delegations and is widely praised for his work in this role at the 1926 Imperial Conference and the 1930 Imperial Conference. In 1927 he goes to New York to represent the government at a hearing into the fate of republican funds in the United States. His career is the prime example of the influence of revolutionary veterans within the higher civil service in the early years of the state. After the change of government following the 1932 Irish general election, he is one of the very few senior civil servants who is effectively removed from his position. He is appointed to be a commissioner of public works, becoming chairman in 1949, a position he holds until his retirement in 1957. In 1939–40 he serves on the Economy Committee established by the government to advise on wartime spending, and in 1941 is a member of a tribunal of inquiry into public transport, which is principally concerned with the poor financial state of Great Southern Railways.

On April 27, 1922, with Michael Collins as his best man, O’Hegarty marries Claire Archer, daughter of Edward Archer, a post office telegraph inspector from Dublin, and Susan Archer (née Matthews). Her brother is William (Liam) Archer. They live at 9 Brendan Road, Donnybrook, Dublin.

O’Hegarty dies on March 14, 1958 in Dublin, leaving an estate of £5,441. His papers are in the University College Dublin (UCD) Archives.