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 The Battle of Castlebar ( ) occurred on 27 August during the Irish Rebellion of 1798 when a combined force of 2,000 Frenchmarker and Irishmarker routed a force of 6,000 British in what would later became known as the Races of Castlebar.


The long-awaited French landing to assist the Irish revolution begun by Theobald Wolfe Tone's Society of United Irishmen had taken place five days previously on 22 August, when almost 1,100 troops under the command of General Jean Joseph Amable Humbert landed at Cill Chuimín Strand, County Mayomarker. Although the force was small, the remote location ensured an unopposed landing away from the tens of thousands of British soldiers concentrated in the east in Leinster, engaged in mopping up operations against remaining pockets of insurgents. The nearby town of Killalamarker was quickly captured after a brief resistance by local yeomen; Just south, Ballinamarker was taken two days later following the rout of a force of cavalry sent from the town to oppose the Irish march. Following the news of the French landing, Irish volunteers began to trickle into the French camp from all over Mayo.

The Lord Lieutenant of Ireland, Lord Cornwallis, requested urgent reinforcements from Englandmarker but in the interim all available forces were concentrated at Castlebarmarker under the command of General Gerard Lake, the victor of the Battle of Vinegar Hillmarker. The build-up of the British forces at Castlebar had reached 6,000 soldiers with dozens of artillery pieces and huge cache of supplies by dawn of the 27th August.


Leaving about 200 French regulars behind in Killalamarker to cover his rear and line of withdrawal, Humbert took a combined force of about 2,000 French and Irish on 26 August to march on and take Castlebarmarker. The obvious nature of his objective presented the reinforced British there with the apparent advantage of being able to deploy their forces to face a head-on attack from the Ballina road and their forces and artillery were accordingly arranged. However, locals advised the French of an alternative route to Castlebar through the wilds along the west of Lough Connmarker, which the British thought impassable for a modern army with attendant artillery train. This route was successfully taken and when Lake’s scouts spotted the approaching enemy, the surprised British had to hurriedly change the deployment of their entire force to face the threat from this unanticipated direction.


The British had barely completed their new deployment when the Franco-Irish army appeared outside the town at about 6.00 a.m. The newly sited British artillery opened up on the advancing French and Irish and cut them down in droves. French officers, however, quickly identified an area of scrub and undergrowth in a defile facing the centre of the artillery line which interfered with, and provided some cover from, the British line of fire. The French launched a bayonet charge, the ferocity and determination of which unnerved units of the militia stationed behind the artillery. The militia units began to waver before the French reached their lines and eventually turned in panic and fled the battlefield, abandoning the gunners and artillery. Some soldiers of the Longfordmarker and Kilkennymarker militias ran to join the republicans and even joined in the fighting against their former comrades. A unit of cavalry and British regular infantry attempted to stand and stem the tide of panic but were quickly overwhelmed.

British retreat

In the headlong flight of thousands of British soldiers, massive quantities of guns and equipment were abandoned, among which was General Lake's personal luggage. Although not pursued a mile or two beyond Castlebar, the British did not stop until reaching Tuammarker, with some units fleeing as far as Athlonemarker in the panic. The panic was such that only the arrival of Cornwallis at Athlone prevented further flight across the Shannon.

Although achieving a spectacular victory, the losses of the French and Irish were high, losing about 150 men, mostly to the cannonade at the start of the battle. The British suffered over 350 casualties of which about 80 were killed, the rest either wounded or captured, including perhaps 150 who joined the republicans. Following the victory, thousands of volunteers flocked to join the French who also sent a request to Francemarker for reinforcements and formally declared a Republic of Connaught.


  • T. Packenham; "The Year of Liberty" (London 1969) ISBN 0812930886 & ISBN 0812930887
  • J.B Gordon "History of the Rebellion in Ireland in the year 1798" (1801)
  • Richard Musgrave "Memoirs of the different rebellions in Ireland" (1801) ISBN 096439250X & ISBN 9780964392502

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