In Austria's First Silesian War against Prussia, he was present at Chotusitz and Prague, and led the advanced guard of Khevenhüller's army in the victorious Danube campaign of 1743. Field Marshal Count Traun, who succeeded Khevenhüller in 1744, thought equally highly of Daun, and entrusted him with the rearguard of the Austrian army when it escaped from the French to attack Frederick the Great. He held important commands in the battles of Hohenfriedberg and Soor, and in the same year (1745) was promoted to the rank of "Feldzeugmeister" (Lieutenant General). After this he served in the Low Countries, and was present at the Battle of Val. He was highly valued by Maria Theresa, who made him commandant of Vienna and a Knight of the Golden Fleece, and in 1754 he was elevated to the rank of "Feldmarschall" (Field-Marshal).