The Battle of Valcour Island, also known as the Battle of Valcour Bay, was a naval engagement that took place on October 11, 1776, on Lake Champlain. The main action took place in Valcour Bay, a narrow strait between the New York mainland and Valcour Island. The battle is generally regarded as one of the first naval battles of the American Revolutionary War, and one of the first fought by the United States Navy. Most of the ships in the American fleet under the command of Benedict Arnold were captured or destroyed by a British force under the overall direction of General Guy Carleton. However, the American defense of Lake Champlain stalled British plans to reach the upper Hudson River valley.

USS Philadelphia is a gunboat of the Continental Navy. She was constructed from July–August 1776 for service during the American Revolutionary War. Manned by Continental Army soldiers, she was part of a fleet under the command of General Benedict Arnold that fought against the British Royal Navy in the Battle of Valcour Island on Lake Champlain. Philadelphia was sunk during the battle on 11 October 1776.