By 1781, the sixth year of the American rebellion, British strategic focus had shifted from the northern states to concentrate in the south. Canada's governor, Frederick Haldimand, was responsible for the defence of the Crown's largest colony against the threat of Franco-American invasion, while assisting overall British strategy. He cleverly employed his sparse resources to vigorously raid the rebels' frontiers and create anxiety, disruption, and deprivation, as his Secret Service undermined their morale with invasion rumours and threatened their Union by negotiating with the independent...