Many Americans don’t realize that in 1775 at the start of the American Revolution, rebel forces invaded Canada, occupying Montréal and attacking the town of Québec (where they soundly beaten).
American privateers also raided Atlantic ports, and revolutionary sympathizers in Nova Scotia attempted a rebellion in that colony.
Although the rebel forces were defeated in Canada sparking another kind of invasion – a wave of Loyalist emigration that would change the make-up of Canada.