As commander of the Third Serbian Army, he participated in all major battles in the Serbian theater in World War I, from Cer and Kolubara, then retreated over frozen Albania, and the participation of the Serbian Army on the Salonika Front. Here, his army fought in the Battle of Kajmakcalan, suffering many casualties. After this battle Sturm was replaced at the head of the Third Army by Miloš Vasić in October 1916. He was sent to Russia to assist the commander of the Serbian Volunteer Corps. In early 1917, he returned via Japan to Thessaloniki, where he was appointed Chancellor of the Order of the Crown, a job he held until the end of the war.