Lochry's Defeat, also known as the Lochry massacre, was a battle fought on August 24, 1781, near present-day Aurora, Indiana, in the United States. The battle was part of the American Revolutionary War (1775–1783), which began as a conflict between Great Britain and the Thirteen Colonies before spreading to the western frontier and bringing American Indians into the war as British allies. The battle was short and decisive: about one hundred Indians under Joseph Brant, a Mohawk war leader who was temporarily in the west, ambushed about an equal number of Pennsylvania militiamen led by Archibald Lochry. Brant and his men killed or captured all of the Pennsylvanians without suffering any casualties.