Schuyler joined the British forces in 1755 during the French and Indian War, raised a company, and was commissioned as its captain by his cousin, Lieutenant Governor James Delancey. In 1756, he accompanied British officer Colonel John Bradstreet to Oswego, where he gained experience as a quartermaster, which ended when the outpost fell to the French. Schuyler took part in the battles of Lake George, Oswego River, Carillon and Fort Frontenac.