Barrimore Matthew "Barry" St. Leger was a British Army officer. St. Leger was active in the Saratoga Campaign, commanding an invasion force that unsuccessfully besieged Fort Stanwix. St. Leger remained on the frontier for the duration of the war; after its conclusion, he served briefly as commander of British forces in Quebec.

The Saratoga campaign in 1777 was an attempt by the British high command for North America to gain military control of the strategically important Hudson River valley during the American Revolutionary War. It ended in the surrender of the British army, which historian Edmund Morgan argues, "was a great turning point of the war, because it won for Americans the foreign assistance which was the last element needed for victory."