Serving in the Cauldron - the Russians' name for the battlefields of Germany and Austria during the war - Ushakov and his unit, the 123rd Mobile Artillery Company, quickly became experts at targeting enemy artillery and headquarters units by scanning for their telltale electronic emissions with their RM-17 battlefield sensor array. This tactic enabled a breakthrough near Vienna, when Ushakov's company of KV-20 self-propelled guns wiped out the headquarters of Battlegroup 14 just minutes before Russian armored units launched their spring offensive.