During the Battle of France one howitzer equipped "Super-Heavy Artillery Battery (schwerster Artillerie-Batterie) 810" under the command of "I Corps", "Army Group B". It bombarded Belgian fortifications of the "PFL I Line" after the fall of Fort Eben-Emael on the first day of the battle. The battery was absorbed by "Heavy Artillery Battalion 641" as its first battery on 27 July 1940 and it fought with that battalion on the Eastern Front during Operation Barbarossa where it initially was assigned to the 9th Army, Army Group Center. In 1942 it participated in the assault on Sevastopol under the command of 11th Army of Army Group South. It accompanied that army north to Leningrad during the summer of 1942 so that it could participate in the siege of Leningrad. Soviet efforts to relieve the siege frustrated several German attempts to consolidate their positions there, but the battalion remained there through the beginning of 1944. It participated in the German efforts to suppress the Warsaw Uprising in August—September 1944.