The Action of 3 July 1810 was a minor naval engagement of the Napoleonic Wars, in which a French frigate squadron under Guy-Victor Duperré attacked and defeated a convoy of Honourable East India Company East Indiamen near the Comoros Islands. During the engagement the British convoy resisted strongly and suffered heavy casualties but two ships were eventually forced to surrender. These were the British flagship, the Windham, which held off the French squadron to allow the surviving ship Astell to escape, and the Ceylon. The engagement was the third successful French attack on an Indian Ocean convoy in just over a year, the French frigates being part of a squadron operating from the Île de France under Commodore Jacques Hamelin.