From 1749 to 1755, the British engaged in a campaign to consolidate its control over Nova Scotia. The resulting conflict led to an Acadian Exodus to French controlled territories in North America, including portions of continental Acadia. In 1755, the British captured Fort Beauséjour, severing the Acadian supply lines to Nova Scotia, and Île-Royale. Unable to make most of the Acadians sign an unconditional oath of allegiance, British authorities undertook a campaign to expel the Acadians in the initial periods of the Seven Years' War.