Originally hired soldiers as distinguished from feudal levies, now bodies of foreign troops in the service of the State; the Scots Guards in France from the 15th to 18th centuries were famous, and Swiss auxiliaries once belonged to most European armies; William III. had Dutch mercenaries in England; under the Georges, German were hired and were used in the American War, the Irish rebellion, and the Napoleonic struggle; in the Crimean War German, Swiss, and Italian were enrolled.