“The war was a contest by both sides to control the other’s logistics. The Soviet lines of communication (LOC) were a double lane highway network which wound through the Hindu Kush Mountains – some of the most inhospitable terrain on earth. The Soviet presence depended on its ability to keep the roads open. Much of the Soviet combat in Afghanistan was a fight for control of the road network. The resistance destroyed over 11,000 Soviet trucks. The DRA truck losses were reportedly higher. The Mujahideen ability to interdict the LOC was a constant concern to the Soviet and prevented them from maintaining a larger occupation force in Afghanistan.”
PDF File Here for Report on Soviet Lessons in Afghanistan