During the American Revolution, the large wheat farms of the Schoharie Valley supplied the Continental Army and became frequent targets of British-allied Loyalists and Iroquois raiding parties. After a Loyalist uprising at the Flockey in 1777, the German Reformed Church at Foxestown, now Schoharie, was fortified with a stockade and blockhouses as Lower Fort, while Middle and Upper Forts were built around houses farther upstream. These forts were manned by Continental troops, militia, and state levies. In October 1780, Sir John Johnson led the largest British raid through the region, and more than 700 troops ravaged the valley, destroying 74 houses, 77 barns, four mills, and nearly the entire harvest in a single day. Middle Fort survived an attack, as did the Lower, or Old Stone, Fort, which sustained cannon damage still visible today. The raiders then continued north to the Mohawk River and turned west, burning everything in their path for the next two days, until New York militia and levies drove them off after battles at Stone Arabia and Klock's Field. On November 7, 1780, General George Washington wrote to Congress that the settlement of Schoharie alone would have delivered 80,000 bushels of grain, but that fine district was now totally destroyed.