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.