The USS Ontario was a lake schooner serving in the United States Navy during the War of 1812. Originally built as a merchant vessel on Lake Ontario, the schooner was purchased by the Navy in October 1812 and commissioned in 1813 under the command of Sailing Master Joseph Stevens. As part of Commodore Isaac Chauncey's small squadron, Ontario played a significant role in defending upstate New York from British and Canadian invasion efforts. Constructed as a merchant ship, Ontario was adapted for naval service, primarily engaging in patrol and support missions on Lake Ontario. Her notable service included participation in the attack on York, Canada, on April 27, 1813, where General Zebulon Pike led 1,700 troops ashore, while the squadron destroyed stores and burned a schooner under construction. The schooner also contributed to the attack on Fort George on May 27, 1813, which compelled the British to evacuate the Niagara Frontier. Throughout the summer, Ontario patrolled the lake to monitor British shipping activity. In August 1813, Ontario participated in a series of engagements with British naval forces under Captain James Yeo. From August 7 to 11, the squadron fought a running engagement, during which heavy weather resulted in the loss of two ships on August 8, and two more ships were captured during the inconclusive firefights on August 10. Despite these losses, a subsequent battle off York on August 28 resulted in the damaging of two British ships and forced the British to withdraw into Burlington Bay. Following the war, Ontario remained on Lake Ontario for patrol duties until the end of hostilities. After being laid up in ordinary, the vessel was sold on May 15, 1815, and returned to merchant service. The USS Ontario’s service exemplifies the strategic use of converted merchant vessels in early American naval operations on the Great Lakes, contributing notably to the American efforts to control Lake Ontario during the War of 1812.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.