The backbone of the Heer (German Army) was the infantry division. Of the 154 divisions deployed against Soviet Union in 1941, including reserves, there were 100 infantry, 19 panzer, 11 motorised, 9 security, 5 Waffen-SS, 4 "light", 4 mountain, 1 SS police, and 1 cavalry. A typical infantry division in June 1941 had 17,734 men organized into the following sub-units:[1]