Thereafter, Frundsberg lived an uninterrupted life of war, campaigning for the Empire and the Habsburgs. In 1509, he was appointed "Highest Field Captain" of the Landsknecht Regiment (occupation force) and participated in the War of the League of Cambrai against the Republic of Venice, winning fame for himself and his men after defending the city of Verona against numerous attacks. In 1512 he was, together with Jakob von Ems, leading the Imperial contingent sent to aid Gaston de Foix to retake Brescia.