For Operation Barbarossa (the invasion of the Soviet Union), it equipped "Artillerie-Abteilung 625". Most guns were replaced by 17 cm barrels as they became available. However, for Case Blue (the German summer offensive in southern Russia), one battery of "Artillery Battalion (Artillerie-Abteilung) 767" was still equipped with them. That same battery retained them through the beginning of the Battle of Kursk in July 1943.