The defeat was the last major engagement of the 1798 rebellion.
Killala had remained for 32 days in the hands of the Rebels and French.

Many Rebels were killed on the day after the battle also, as the army searched the town and surrounding countryside for fugitives.
The British forces burned many houses in the area.
On both days, a number of innocent civilians and loyalists were also killed.
The French officers surrendered – afterwards they were sent to Dublin, and from there to London.
Henry O'Keane, though an officer in the French army, was not treated as such when captured.
O'Keane was sent to Castlebar, where he was tried by Court martial.
He was expelled from and forbidden ever to return to British territories.

Courts martial began the day after the battle.
The proceedings took place at the house of Owen Morrisson in the town.
Two Rebel leaders, Richard Bourke and Captain Bellew, were tried on Monday evening and found guilty.
They were executed the next morning in the park behind the castle.
Another prominent Rebel, Roger MacGuire, was transported to Botany Bay.
MacGuire's father was hanged.
Courts martial and executions of other Rebels continued for a week.
Seventy-five prisoners were tried at Killala.

The Church of Ireland Bishop of Killala and Achonry, Joseph Stock, left the most detailed eye-witness account of the battle.
It was published in 1800.
The defeat was the last major engagement of the 1798 rebellion. Killala had remained for 32 days in the hands of the Rebels and French.
Many Rebels were killed on the day after the battle also, as the army searched the town and surrounding countryside for fugitives. The British forces burned many houses in the area. On both days, a number of innocent civilians and loyalists were also killed. The French officers surrendered – afterwards they were sent to Dublin, and from there to London. Henry O'Keane, though an officer in the French army, was not treated as such when captured. O'Keane was sent to Castlebar, where he was tried by Court martial. He was expelled from and forbidden ever to return to British territories.
Courts martial began the day after the battle. The proceedings took place at the house of Owen Morrisson in the town. Two Rebel leaders, Richard Bourke and Captain Bellew, were tried on Monday evening and found guilty. They were executed the next morning in the park behind the castle. Another prominent Rebel, Roger MacGuire, was transported to Botany Bay. MacGuire's father was hanged. Courts martial and executions of other Rebels continued for a week. Seventy-five prisoners were tried at Killala.
The Church of Ireland Bishop of Killala and Achonry, Joseph Stock, left the most detailed eye-witness account of the battle. It was published in 1800.
Battle of Killala