The invasion of Isle de France was a complicated but successful British amphibious operation in the Indian Ocean, launched in November 1810 during the Napoleonic Wars. During the operation, a substantial military force was landed by the Royal Navy at Grand Baie, on the French colony of Isle de France (now Mauritius). Marching inland against weak French opposition, the British force was able to overwhelm the defenders in a series of minor engagements, culminating in the capture of the island's capital Port Napoleon and the surrender of Governor Charles Mathieu Isidore Decaen. The surrender eliminated the last French territory in the Indian Ocean and among the military equipment captured were five French Imperial Navy frigates and 209 heavy cannon. Isle de France was retained by Britain at the end of the war under the name of Mauritius and remained part of the British Empire until 1968.
The operation was the culmination of two years of conflict over the island and the neighbouring Isle Bourbon between frigate squadrons commanded by Josias Rowley and Jacques Hamelin. Hamelin repeatedly raided British trade convoys and Rowley responded with amphibious assaults on French harbours, but neither had gained ascendancy by the time Rowley sent most of his force to attack the port of Grand Port on Isle de France in August 1810. At the ensuing battle at Grand Port the British squadron was destroyed and Hamelin began to blockade Rowley on Isle Bourbon. As British reinforcements were urgently dispatched, several actions were fought between recently arrived British ships and the more numerous French forces. At the last of these on 18 September, Hamelin was defeated and captured by Rowley. This allowed Rowley to build his forces over the next two months until they were sufficient for a successful invasion, which was led by the recently arrived Admiral Albemarle Bertie.