The Battle of Lake Pontchartrain was a single-ship action on September 10, 1779, part of the Anglo-Spanish War. It was fought between the British sloop-of-war HMS West Florida and the Continental Navy schooner USS Morris in the waters of Lake Pontchartrain, then in the British province of West Florida. West Florida was patrolling on Lake Pontchartrain when it encountered Morris, which had set out from New Orleans with a Spanish and American crew headed by Continental Navy Captain William Pickles. The larger crew of Morris successfully boarded West Florida, inflicting a mortal wound on its captain, Lieutenant John Payne. The capture of West Florida eliminated the major British naval presence on the lake, weakening already tenuous British control over the western reaches of West Florida.