The Battle of Castlebar takes place on August 27, 1798. A combined force of about 800 French troops under GeneralJean Joseph Amable Humbert and 2,000 United Irishmen rebels defeat a much larger British Crown force of 3,000 to 5,000 men led by General Gerard Lake. The French, though exhausted from long marches, exploit the disorganisation of Lake’s militia-heavy army, routing it in what becomes known as the “Castlebar Races” or “Races of Castlebar.” The British suffer heavy casualties — around 400 killed or wounded and 800 captured, while the French lose about 200 to 220.
The victory at Castlebar is a significant boost to the rebels, but it also alarms the British government. Cornwallis, commanding the Crown forces in the west, is tasked with reasserting control and preventing further advances into Ulster. By September 4, he has moved from Tuam to threaten Castlebar, aiming to recapture the town and disrupt Humbert’s plans to push north into County Sligo and beyond.
Anticipating Cornwallis’s move, Humbert evacuates Castlebar with his remaining troops — roughly 800 French soldiers and 1,000 Irish insurgents — and marches north into County Sligo. His objective is to ignite further rebellion in Ulster, continuing the momentum of the short-lived “Republic of Connacht.” This evacuation leaves the town vulnerable to British reoccupation.
While Humbert’s force is retreating, fresh risings broke out in counties Longford and Westmeath, showing the insurrection’s reach. However, these uprisings are ultimately suppressed, and the British, under commanders like Cornwallis, work to mop up rebel strongholds across Ireland.
In summary, on September 4, 1798, Cornwallis’s advance from Tuam is a direct response to the rebel victory at Castlebar, aiming to regain a key rebel-held town and halt Humbert’s northern push. The move reflects the British strategy of localized offensives to counter the momentum of the Irish Rebellion of 1798.
(Pictured: Charles Cornwallis, 1st Marquess Cornwallis)
Humbert is the eldest of six children of Jean-Joseph Humbert, a farmer and trader, and Catherine (née Privat), who dies when he is three years old. From a modest rural background, he works briefly as a hatter and rabbit hunter before entering the military in July 1789 amid the early stages of the French Revolution.
In 1796, Humbert is assigned to prepare for an expedition to Ireland. In the ill-fated Expédition d’Irlande, his ship Droits de l’Homme is wrecked off the Bay of Audierne in January 1797, but he survives. In 1798, he leads about 1,000 French troops to Ireland, landing at Killala. His forces fight and win at Ballina and the Races of Castlebar, proclaiming a Republic of Connacht before being defeated and captured at the Battle of Ballinamuck. He is exchanged for British prisoners.
In 1810, Humbert emigrates to New Orleans, where he becomes acquainted with French pirate Jean Lafitte. He joins the Buenos Aires rebellion in 1814 before returning home. In 1815, he fights the British at the Battle of New Orleans in the War of 1812, earning thanks from General Andrew Jackson. He later lives as a schoolteacher in New Orleans until his death on January 3, 1823.
Humbert’s career spans revolutionary France, Napoleonic campaigns, and post-Napoleonic adventures, making him a notable figure in late 18th- and early 19th-century military history.
Humbert crosses the River Shannon at Ballintra Bridge on September 7, destroying it behind them, and continues to Drumshanbo where they spend the night – halfway between his landing-point and Dublin. News reaches him of the defeat of the Westmeath and Longford rebels at Wilson’s Hospital School at Multyfarmham and Granard from the trickle of rebels who have survived the slaughter and reached his camp. With Cornwallis’ huge force blocking the road to Dublin, facing constant harassment of his rearguard and the pending arrival of General Gerard Lake‘s command, Humbert decides to make a stand the next day at the townland of Ballinamuck on the Longford/Leitrim county border.
Humbert faces over 12,000 Irishmen and English forces. General Lake is close behind with 14,000 men, and Cornwallis is on his right at Carrick-on-Shannon with 15,000. The battle begins with a short artillery duel followed by a dragoon charge on exposed Irish rebels. There is a brief struggle when French lines are breached which only ceases when Humbert signals his intention to surrender and his officers order their men to lay down their muskets. The battle lasts little more than an hour.
While the French surrender is being taken, the 1,000 or so Irish allies of the French under Colonel Bartholomew Teeling, an Irish officer in the French army, hold onto their arms without signaling the intention to surrender or being offered terms. An attack by infantry followed by a dragoon charge breaks and scatters the Irish who are pursued into a bog where they are either bayoneted or drowned.
A total of 96 French officers and 746 men are taken prisoner. British losses are initially reported as 3 killed and 16 wounded or missing, but the number of killed alone is later reported as twelve. Approximately 500 French and Irish lay dead on the field. Two hundred Irish prisoners are taken in the mopping-up operations, almost all of whom are later hanged, including Matthew Tone, brother of Wolfe Tone. The prisoners are moved to the Carrick-on-Shannon Gaol. The French are given prisoner or war status however the Irish are not and some are hanged and buried in St. Johnstown, today known as Ballinalee, where most are executed in a field that is known locally as Bully’s Acre.
Humbert and his men are transported by canal to Dublin and exchanged for British prisoners of war. Government forces subsequently slowly spread out into the rebel-held “Irish Republic,” engaging in numerous skirmishes with rebel holdouts. These sweeps reach their climax on September 23 when Killala is captured by government forces. During these sweeps, suspected rebels are frequently summarily executed while many houses thought to be housing rebels are burned. French prisoners of war are swiftly repatriated, while United Irishmen rebels are executed. Numerous rebels take to the countryside and continue guerrilla operations, which take government forces some months to suppress. The defeat at Ballinamuck leaves a strong imprint on Irish social memory and features strongly in local folklore. Numerous oral traditions are later collected about the battle, principally in the 1930’s by historian Richard Hayes and the Irish Folklore Commission.
(Pictured: Watercolour plan by an I. Hardy of the Battle of Ballinamuck in County Longford on September 8, 1798, showing position of the English & French Armies previous to the surrender of the latter at Balinamuck)
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