Auguste saw action in the War of the Polish Succession - in May 1734 served at the battle at Colorno. He also fought at San Pietro before his regiment was sent to relieve the bataillon du Dauphin, then blockaded by Imperial forces at Secchia (18 September 1734). He fought at Guastalla on 21 September, where one of his contemporaries from the Metz military school, lieutenant Charles de Pagès, was seriously wounded. After the capture of Mirandole, Keralio was sent into winter quarters at San Secondo in the Duchy of Parma.