Fort Allen was a structure, built in 1774 in Hempfield Township, Westmoreland County, Pennsylvania, for protection from Indian attacks. Roughly 800 pioneer settlers in Hempfield, a large number of them German, had petitioned the colonial government for aid and protection from Indian attacks. In response to that, Fort Allen was built. It is believed that Fort Allen was named for Andrew Allen of the state's then governing body, the Supreme Executive Council. The fort was commanded by Col. Christopher Truby (in one source, spelled "Trubee"). Fort Allen was a frontier fort for Dunmore's War in 1774 and the American Revolutionary War. It was also known as Truby's Blockhouse. It was never involved in an emergency.