The action of 21 July 1781 was a naval skirmish off the harbour of Spanish River, Cape Breton, Nova Scotia (present-day Sydney, Nova Scotia), during the War of American Independence. Two light frigates of the French Navy, captained by La Pérouse and Latouche Tréville, engaged a convoy of 18 British ships and their Royal Navy escorts. The French captured two of the British escorts while the remainder of the British convoy escaped.