At Kesselsdorf it was the wing led by the young Maurice that carried the Austrian lines and won his father Leopold's last campaign. In the years of peace preceding the Seven Years' War, Moritz was employed by Frederick the Great in the colonization of the wastelands of Pomerania and the Oder Valley. When the king took the field again in 1756, Maurice was in command of one of the columns which hemmed in the Saxon army in the lines of Pirna, and he received the surrender of Rutowski's force after the failure of the Austrian attempts at relief.