In the following year, under Prince Henry of Prussia, Hülsen was entrusted with the defense of occupied Saxony, and was appointed commander-in-chief on 21 April, when the prince was removed to Silesia. At this point, the memory of the old general evidently diminished, for the king gave him a major general to assist his command. On 29 October 1762 at the Battle of Freiberg, the last great battle of the Seven Years' War, he could not participate as planned, since his replacement had not yet arrived, but he advanced to Pretzschendorf after the battle.