The Battle of Kilrush was a minor engagement at the start of the Irish Confederate Wars. It was fought in June 1642 between an English army under James Butler, 1st Duke of Ormonde, and Richard Butler, Viscount Mountgarrett , who led an untrained horde of Irish troops raised during the Irish Rebellion of 1641. Ormonde led a punitive raid into rebel held territory, burning the lands of landowners who had joined the rebellion. His troops marched from Dublin to Portlaoise, re-supplying the English garrison there before returning to Dublin. On their return march, the government troops were intercepted by Mountgarret’s rebel militia at Kilrush, near Athy in County Kildare. The Irish troops were badly equipped and completely untrained, and after a short fire fight, many of them fled. Most of the Irish reached the safety of an nearby bog, where the English horse could not follow, but some of them were overtaken and killed. Irish sources claim their casualties were very light, while Ormonde claimed that over 500 of them had been killed. It is probably that losses on both sides were low. Ormonde afterwards successfully returned to Dublin.