The Battle of Scarrifholis, also spelt Scariffhollis was fought on 21 June 1650, near Letterkenny in County Donegal during the Cromwellian conquest of Ireland. A force loyal to the Commonwealth of England under Charles Coote defeated the Catholic Ulster Army, commanded by Heber MacMahon, Roman Catholic Bishop of Clogher.
Although outnumbered, most of Coote's troops were New Model Army veterans, and had three times the number of cavalry. After an hour of fighting, the Ulster army collapsed and fled, losing most of its men, officers, weapons, and supplies. The battle secured the north of Ireland for the Commonwealth and cleared the way to complete the Cromwellian conquest of Ireland.
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