War of 1812: British forces abandon their unsuccessful siege of Fort Erie.

The War of 1812 was fought by the United States and its allies against the United Kingdom and its allies in North America. It began when the United States declared war on Britain on 18 June 1812. Although peace terms were agreed upon in the December 1814 Treaty of Ghent, the war did not officially end until the peace treaty was ratified by the United States Congress on 17 February 1815.

The siege of Fort Erie, also known as the Battle of Erie, from 4 August to 21 September 1814, was one of the last engagements of the War of 1812, between British and American forces. It took place during the Niagara campaign, and the Americans successfully defended Fort Erie against a British army. During the siege, the British suffered high casualties in a failed storming attempt; they also suffered casualties from sickness and exposure in their rough encampments. Unaware that the British were about to abandon the siege, the American garrison launched a sortie to destroy the British siege batteries, during which both sides again suffered high losses.

Old Fort Erie, also known as Fort Erie, or the Fort Erie National Historic Site of Canada, was the first British fort to be constructed as part of a network developed after the Seven Years' War was concluded by the Treaty of Paris (1763), at which time France ceded its territories east of the Mississippi River to Great Britain. The installation is located on the southern edge of what is now the Town of Fort Erie, Ontario, directly across the Niagara River from Buffalo, New York, United States.

September 21 is the 264th day of the year in the Gregorian calendar; 101 days remain until the end of the year.