Corps of Colonial Marines
The Corps of Colonial Marines were two different Royal Marine units raised from former black slaves for service in the Americas at the behest of Alexander Cochrane. The units were created at two separate periods: 1808-1810 during the Napoleonic Wars; and then again during the War of 1812; both units being disbanded once the military threat had passed.
Source: Wikipedia — Corps of Colonial Marines (CC BY-SA 4.0)