In 1734 the War of the Polish Succession brought him into the field again. He was present at the Battle of Parma (29 June 1734), where Count Mercy, the Austrian commander, was killed, and after Mercy's death he held the chief command of the army in Italy until the arrival of Field Marshal Königsegg under whom he again distinguished himself at the Battle of Guastalla (19 September 1734). He was once more in command during the operations which followed the battle, and his skillful generalship won for him the grade of General of Cavalry. He continued in military and diplomatic employment in Italy to the close of the war.