Charles Oman,
Wellington's Army, 1809-1814
“ Men soon began to follow in considerable numbers, and after two provisional infantry regiments had been formed in August, a larger organization, to be called the King’s German Legion, was authorized in December. It included light and line infantry, heavy and light cavalry, artillery and engineers. All through 1804 new units were being rapidly created, mainly from Hanoverians, but not entirely, for other recruits of German nationality were accepted. But all the officers, nearly all the sergeants, and the large majority of the rank and file came from the old Electoral army. ”
