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The Tunnel Trench Assault at the Battle of Cambrai

At dawn on the morning of November 20, 1917, the 16th (Irish) Division of the British Army assaults an area of the German lines known as “Tunnel Trench,” named for an elaborate tunnel system that runs along it. The attack is meant as a diversion for the main attack, about eight miles to the southeast at Cambrai, France, where six infantry and two cavalry divisions of the British Expeditionary Force, with additional support from fourteen squadrons of the Royal Flying Corps, join the British Tank Corps in a surprise attack on the German lines.

By autumn 1917, three years into World War I, continuous shelling and lack of drainage has transformed the Ypres Salient, on the Western Front, into a waterlogged quagmire. In Ireland, meanwhile, a month earlier, Eamon de Valera becomes president of Sinn Féin and decides to push for an independent Irish republic. Despite the growing political turmoil at home, in France, on firm ground near the town of Cambrai, the British Army’s 16th (Irish) Division again proves to be formidable adversaries for the Germans.

According to the divisional historian, at Cambrai, the “swift and successful operation by 16th Division was a model of attack with a limited objective.” In addition to securing 3,000 yards of trench, 635 prisoners are captured from the German army’s 470th and 471st Regiments and 330 German bodies are counted in the trenches. More importantly, though, the mayhem caused by the diversionary assault contributes greatly to the initial success of the Cambrai offensive, though the offensive eventually sputters, dragging the war into 1918.

Cambrai becomes the field of operations when the British Commander-in-Chief, Field Marshal Douglas Haig, recognising that it is impossible to launch further military operations in the Ypres sector, seeks a new battlefield where he hopes success can be achieved before year’s end. Lieutenant Colonel John Fuller of the Tank Corps and General Julian Byng, commander of the Third Army, recommend that a massed assault by 400 tanks should be mounted across the firm, chalky ground to the southwest of Cambrai. Haig adopts this proposal, confident that the tanks can punch a hole through the mighty Hindenburg Line and allow his underused Cavalry Divisions to break through to the enemy rear.

In order to create maximum confusion among the Germans, Sir Aylmer Haldane, commander of VI Corps, is ordered to stage a diversionary attack. The area selected for the assault is about eight miles to the northwest of Cambrai, where the British line passes through the villages of Bullecourt and Fontaine-lès-Croisilles. The units select to make this subsidiary attack are 3rd Army and 16th (Irish) Division.

The defences of the Hindenburg Line opposite VI Corps positions consists of Tunnel Trench, a heavily defended front-line trench, with a second, or support trench, some 300 yards behind. The whole area is scattered with concrete machine gun forts, or Mebus, similar to those that had decimated the 16th (Irish) Division at the Battle of Langemarck three months earlier.

Tunnel Trench is so called because it has a tunnel 30 or 40 feet below ground along its entire length, with staircase access from the upper level every 25 yards. The entire tunnel has electric lighting, and side chambers provide storage space for bunks, food, and ammunition. Demolition charges are set that can be triggered from the German rear in order to prevent the defences from falling into British hands.

The 16th (Irish) Division, attacking on a three-brigade front, is assigned the task of capturing a 2,000-yard section of the trench network. On the right flank of the Irishmen, 3rd Division’s 9th Brigade is detailed to capture an additional 800 yards. One unusual feature of the attack is that there is to be no preliminary bombardment as surprise is the key to the success of the operation. Once the assault begins, however, 16th (Irish) Division’s artillery, reinforced with guns from the 34th Division, is to open a creeping barrage upon the German positions.

The morning of the advance, November 20, is overcast, with low visibility. At 6:20 a.m., the Divisional 18 pounder-field guns open fire, and the leading assault companies spring from their jump-off positions. At the same time, Stokes mortars begin to lay a smoke barrage upon the German trenches in imitation of a gas attack. This deception proves successful, as many German troops don cumbersome gas masks and retreat to the underground safety of the tunnel, thus leaving the exposed portion of the trench undefended.

On the left flank, the attack of the 49th Brigade is launched by 2nd Royal Irish Regiment and 7/8th Royal Irish Fusiliers. They quickly cross the 200 yards of no-man’s-land and reach the enemy frontline just as the barrage lifts. Resistance above ground is minimal, and storming parties began the task of flushing the Germans from the tunnel with Mills bombs and bayonets.

Once the tunnel is secure, sappers, acting on information obtained by 7th Leinster Regiment’s intelligence officer, cut the leads connecting the demolition charges. Supporting companies then press on to capture Tunnel Support Trench, while Divisional support units rapidly wire and made secure the new defensive front in anticipation of German counterattacks.

Only on the extreme left flank does 49th Brigade encounter any serious opposition. In this sector, Company “B” of the 7/8th Royal Irish Fusiliers suffers heavy losses inflicted by concentrated machine gun fire from Mebus Flora. Nearly one-hour elapses before resistance from this strong point can be overcome.

In the centre, 10th and 2nd Royal Dublin Fusiliers head the attack of the 48th Brigade. The advance here is so rapid that the Irish find many Germans still wearing gas masks and unable to fight. Two more Mebus, Juno and Minerva, are stormed and many more prisoners taken, particularly by 10th Royal Dublin Fusiliers which captures 170 Germans.

Leading the attack on the right flank is 6th Connaught Rangers and 1st Royal Munster Fusiliers, both of which belong to the 47th “Irish Brigade.”

After capturing their assigned section of Tunnel Trench, two companies of Rangers press forward to assault the strong points known as Mars and Jove. The Division had learned from the disastrous frontal attack made at Langemarck, and so the Rangers work around to the rear before pressing home with the bayonet.

Unfortunately, 3rd Division fails in its attempt to capture the trench network immediately to the right of 16th (Irish) Division, and the flank of the Connaught Rangers is thus exposed to a savage counterattack. The Rangers ferociously engage the Germans and use captured “potato masher” grenades brought up from the tunnel to great effect. Eventually, overwhelming numbers begin to tell, and “A” Company is forced to yield Jove and fall back upon “B” Company, which is holding Mars.

These two isolated companies doggedly hold their ground for several hours. The situation only improves when the Divisional pioneer battalion, the 11th Hampshire Regiment, digs a communication trench across the fire-swept no-man’s-land, thereby allowing the support companies of the Rangers to come to the aid of their comrades. The front is finally stabilised three days later when 7th Leinster Regiment recaptures and consolidates Jove and successfully assaults the untaken section of Tunnel Trench.

On the first day of the Battle of Cambrai, General Byng’s eight attacking Divisions achieve complete surprise and pierce the Hindenburg Line, driving the Germans back four miles toward Cambrai itself. Having captured 8,000 prisoners and 100 guns for the loss of only 5,000 British casualties, it is small wonder that church bells are sounded in celebration in Britain for the first time during the war.

Unfortunately, Byng lacks sufficient reserves to exploit, or consolidate his success, and German counterattacks, launched by some 20 Divisions, recover most of the lost ground. Although the battle ultimately ends in failure for the British, the willingness to employ new weaponry and tactics at Cambrai and during the diversionary assault upon Tunnel Trench, points the way to the final victory in 1918.

Although the capture of Tunnel Trench contributes greatly to the early success at Cambrai, it proves costly as VI Corps suffers 805 casualties. Most of these occur close to Jove Mebus, where the Connaught Rangers had engaged the enemy in hand-to-hand combat.

Perhaps an idea of the ferocious nature of this form of trench warfare can be gleaned from Father William Doyle, chaplain of the 8th Royal Irish Fusiliers, who once remarks, “We should have had more prisoners, only a hot-blooded Irishman is a dangerous customer when he gets behind a bayonet and wants to let daylight through everybody.”

(From: “Tunnel Trench: 16th (Irish) Division Clears the Way at Cambrai,” by Kieron Punch, posted by The Wild Geese, http://www.thewildgeese.irish, January 18, 2013 | Pictured: Troops from the Royal Irish Regiment about to go into action at Cambrai)


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Beginning of the Battle of Dublin and the Irish Civil War

The Battle of Dublin is a week of street battles in Dublin from June 28 to July 5, 1922, that mark the beginning of the Irish Civil War. Six months after the Anglo-Irish Treaty ended the Irish War of Independence, it is fought between the forces of the new Provisional Government and a section of the Irish Republican Army (IRA) that opposes the Treaty.

The Irish Citizen Army also becomes involved in the battle, supporting the anti-Treaty IRA in the O’Connell Street area. The fighting begins with an assault by Provisional Government forces on the Four Courts building and ends in a decisive victory for the Provisional Government.

On April 14, 1922, about 200 Anti-Treaty IRA militants, with Rory O’Connor as their spokesman, occupy the Four Courts in Dublin, resulting in a tense stand-off. They want to spark a new armed confrontation with the British, which they hope will bring down the Anglo-Irish Treaty, unite the two factions of the IRA against their former common enemy and restart the fight to create an all-Ireland Irish Republic. At the time the British Army still has thousands of soldiers concentrated in Dublin, awaiting evacuation.

Winston Churchill and the British cabinet have been applying pressure on the Provisional Government to dislodge the rebels in the Four Courts, as they consider their presence a violation of the Treaty. Such pressure falls heaviest on Michael Collins, President of the Provisional Government Cabinet and effective head of the regular National Army. Collins, a chief IRA strategist during the War of Independence from Britain, has resisted giving open battle to the anti-Treaty militants since they occupied Four Courts in April. His colleagues in the Provisional Government Cabinet, including Arthur Griffith, agree that Collins must mount decisive military action against them.

In June 1922 the Provisional Government engages in intense negotiations with the British Cabinet over a draft Constitution that seeks to avert the impending civil war. They particularly seek to remove the requirement of an oath to the British Crown by all members of the Dublin government, a key point of contention with anti-Treaty partisans. However, the conservative British Cabinet refuses to cooperate. The pro-treaty element of Sinn Féin wins the elections on June 16.

Following the assassination of Sir Henry Wilson in London on June 22, 1922, and the arrest by Four Courts troops of National Army Deputy Chief of Staff Gen. J. J. “Ginger” O’Connell, British pressure on the Provisional Government intensifies. The British now threaten to invade and re-occupy all of Ireland. On June 27 the Provisional Government Cabinet agrees on an ultimatum to the Four Courts garrison to evacuate or face immediate military action.

Churchill offers a loan of British artillery for use by the National Army, along with 200 shells from their store of 10,000 at Kilmainham, three miles away. It is possible that some British special troops are also covertly loaned. Two 18-pounder field guns are placed on Bridge Street and Winetavern Street, across the River Liffey from the Four Courts complex. After an ultimatum is delivered to the anti-Treaty garrison in the early hours of June 28, the National Army commences the bombardment of Four Courts.

No authoritative record exists regarding the order to commence bombardment. Historians tend to attribute the order to Collins, but some biographers dispute this. Anti-Treaty survivors allege that they are preparing for an 8:00 a.m. evacuation when the bombardment begins at 4:00 a.m.

Inside the building are 12 members of the Irish Republican Army Executive, including Chief of Staff Joe McKelvey, Director of Engineering Rory O’Connor, Quartermaster General Liam Mellows and Director of Operations Ernie O’Malley. The garrison consists of roughly 180 men drawn from the 1st and 2nd Battalions of the IRA’s 1st Dublin Brigade, commanded by Commandant Paddy O’Brien, armed for the most part only with small arms apart from one captured armoured car, which they name “The Mutineer.” The members of the IRA Army Executive are the political leaders of the garrison but serve as common soldiers under the command of O’Brien. The Anti-Treaty side fortifies the Four Courts to some extent, planting mines around the complex and barricading the doors and windows, but their leadership orders them not to fire first, in order to retain the moral high ground, and so the Free State troops are allowed to surround the Four Courts.

After the first day’s bombardment proves ineffective, the British give the Free State two more 18-pounder cannon and proffer 60-pounder howitzers along with an offer to bomb the Four Courts from the air. Collins turns down the latter two offers because of the risk of causing heavy civilian casualties. On June 29, Free State troops storm the eastern wing of the Four Courts, losing three killed and 14 wounded and taking 33 prisoners. The republicans’ armoured car is disabled and abandoned by its crew. Early the next day O’Brien is injured by shrapnel and O’Malley takes over military command in the Four Courts. By this time the shelling has caused the Four Courts to catch fire. In addition, orders arrive from Oscar Traynor, the anti-treaty IRA commander in Dublin, for the Four Courts garrison to surrender, as he cannot reach their position to help them. O’Malley rules this order invalid, as the Four Courts is a GHQ operation. However, in view of the rapidly deteriorating situation, at 3:30 p.m. on June 30, O’Malley surrenders the Four Courts to Brigadier General Paddy Daly of the Free State’s Dublin Guard unit. Three of the republican garrison die in the siege.

Several hours before the surrender, the Public Record Office of Ireland (PRO) block located in the western block of the Four Courts, which is used as an ammunition store by the Four Courts garrison, is the centre of a huge explosion, destroying Irish state records going back to the Anglo-Norman conquest. Forty advancing Free State troops are badly injured. Assigning blame for the explosion remains controversial. It is alleged by the National Army Headquarters that the Anti-treaty forces deliberately booby-trapped the PRO to kill advancing Free State troops. Tim Healy, a government supporter, later claims that the explosion is the result of land mines laid before the surrender, which explode after the surrender. However, a study of the battle concludes that the explosion is caused by fires ignited by the shelling of the Four Courts, which eventually reach two truckloads of gelignite in the munitions factory. A towering mushroom cloud rises 200 feet over the Four Courts.

At this stage in the battle troops on each side still have a sense of kinship with the other, as most of them had fought together in the Irish Republican Army during the Irish War of Independence. By appealing to friends on the Free State side, several anti-Treaty leaders among the Four Courts garrison, notably Ernie O’Malley and Seán Lemass, escape from captivity to continue the fight.

Despite the Free State force’s success in taking the Four Courts, fighting continues in Dublin until July 5. On June 29 anti-Treaty IRA units from the Dublin Brigade led by Oscar Traynor have occupied O’Connell Street, part of Parnell Square, York Street and some of other locations to try to distract Free State attention from their attack on the Four Courts. Not all the IRA units in the capital are prepared to fight against the new Irish government, however, and their numbers are probably about 500 throughout the city. Their numbers are supplemented by about 150 Citizen Army men and women who bring with them arms and ammunition dumped since the insurrection of Easter 1916.

The republicans occupy the northeastern part of O’Connell Street, with their strong point at “the block,” a group of buildings that the Anti-Treatyites had connected by tunneling through the walls. They had also taken over the adjoining Gresham, Crown, Granville and Hammam hotels. Their only position on the western side of the street is in the YMCA building. Additionally, they have an outpost south of the River Liffey at the Swan Pub on Aungier Street. Oscar Traynor apparently hopes to receive reinforcements from the rest of the country, but only Anti-Treaty units in Belfast and Tipperary reply and both of them arrive too late to take part in the fighting.

The Provisional Government troops, commanded by General Tom Ennis, start by clearing out the outlying anti-treaty garrisons, which is accomplished by July 1. They then draw a tighter cordon around O’Connell Street. Artillery is used to drive the Anti-Treaty fighters out of positions on Parnell Street and Gardiner Street, which gives the Free State troops a clear field of fire down O’Connell Street.

The republican outpost in the YMCA is eliminated when Free State troops tunnel underneath it and detonate a bomb. Traynor’s men in “the block” hold out until artillery is brought up, under the cover of armored cars, to bombard them at point-blank range. Incendiary bombs are also planted in the buildings. Traynor and most of his force make their escape when the buildings they are occupying catch fire. They mingle with civilian crowds and make their way to Blessington.

Left behind is Republican leader Cathal Brugha and a rear guard of 15 men, who stay behind in the Hammam Hotel after Traynor, and most other IRA men have left. At 5:00 p.m. on July 5, when the fires make the hotel untenable, Brugha orderes his men to surrender. He, however, stays behind, only to emerge from the building alone, armed with a revolver. He is shot in the thigh by Free State troops and dies later from blood loss. There are some further sporadic incidents of fighting around the city as Free State troops disperse anti-treaty IRA groups.

Cathal Brugha is the last casualty in the Battle of Dublin, which costs the lives of at least 80 people (15 anti-Treaty IRA Volunteers, 29 National Army soldiers, one British Royal Air Force serviceman and 35 civilians) and over 280 wounded. In addition, the Free State takes over 450 Republican prisoners. The high civilian casualties are doubtless the result of the use of heavy weapons, especially artillery, in a densely populated urban area.

When the fighting in Dublin dies down, the Free State government is left firmly in control of the Irish capital and the anti-treaty forces disperse around the country. Roundups after the fighting result in more Republican prisoners and the death of prominent anti-Treaty activist Harry Boland who is shot dead in Skerries, Dublin, on July 31.

Oscar Traynor, Ernie O’Malley and the other anti-Treaty fighters who escape the fighting in Dublin regroup in Blessington, around 30 km southwest of the city. An anti-Treaty IRA force from County Tipperary had arrived there but too late to participate in the Dublin fighting. Instead, this force heads south and takes a string of towns, including Enniscorthy and Carlow, but quickly abandons them when faced with superior Free State forces. Most of the Republicans then retreat further south to the so-called Munster Republic, territory southwest of a line running from Limerick to Waterford. This in turn is taken by the Free State in an offensive from July to August 1922.

Four of the Republican leaders captured in the Four Courts, Rory O’Connor, Liam Mellows, Joe McKelvey and Richard Barrett, are later executed by the government in reprisal for the Anti-Treaty side’s killing of TD Seán Hales. The street where Cathal Brugha is killed is later renamed Cathal Brugha Street in his honour.

The destruction of irreplaceable historical record in the PRO explosion (and the 1921 burning of the Custom House) has impaired Irish historiography. Some had been calendared to varying degrees. The National Archives of Ireland and Irish Manuscripts Commission have assembled and published original documents from other sources to mitigate the loss. A consortium led by Trinity College Dublin is creating the website “Beyond 2022” to provide a “virtual recreation” of the PRO and its contents, in time for the centenary of the explosion.

(Pictured: The Four Courts ablaze during the Battle of Dublin, June 30, 1922)