During the American Revolution (1775–83), German auxiliary troops provided a vital element of the British war effort. Some 30,000 German troops served in North America, continuing a long-established relationship between Britain and various German principalities. These troops were widely referred to as mercenaries, implying that they sold their services individually, but they were in fact regular troops hired as a body by the British. Initially feared by the American population, the German troops came to be highly respected by their opponents. Their role in the fighting would inform the tactics and methods of a generation of German officers who returned to Europe after the war, many of whom went on to hold senior commands during the French Revolutionary and Napoleonic wars.