Like the soldiers they commanded, many Soviet officers were inexperienced and lacked training at the beginning of the Great Patriotic War. Stalin's ruthless purge of officers of the Red Army in 1937 had denuded the organisation of leadership and left deep scars in the survivors' minds. Throughout the war, showing initiative was seen as a dangerous trait, and most Soviet officers would follow their orders to the letter even if they meant marching their men to certain death. Soviet operational leadership improved immeasurably over time, but the heavy casualties endured by the Red Army indicates that overall battlefield control remained a blunt instrument.