The Soviet Air Forces flew 2535 re-supply sorties with small bi-plane Polikarpov Po-2 's , delivering a total of 156 50-mm mortars , 505 anti-tank rifles , 1478 sub-machine guns , 520 rifles , 669 carbines , 41 780 hand grenades , 37 216 mortar shells , over 3 mln .
The Soviet Air Forces flew 2535 re-supply missions with small bi-plane Polikarpov Po-2 's . They delivered a total of 156 50-mm mortars , 505 anti-tank rifles , 1478 sub-machine guns , 520 rifles , 669 carbines , 41 780 hand grenades , 37 216 mortar shells , over 3 mln .