The American invasion of Lower Canada was stopped in 1813 by a force of natives and French Canaddians Voltigeurs (provincial "regulars" who weren't british regualrs nor were they militia) against a...
During the war of 1812. Francis Scott Key was in a battle with his team and fighting the British and then, after a big bomb after all the smoke went away, everybody saw that the United States flag...
After two years of war, the British finally accepted America as an independent nation, and stopped harrassing the US (Britain stopped kidnapping US seaman abroad, etc).