The Battle of Tutung (1934) occurred when Gen. Ma Zhongying's Chinese Muslim 36th Division was attacked by the Soviet Russian Army on the banks of the frozen Tutung River. The battle took place over several days, and Soviet bombers used mustard gas. At one point the Chinese Muslim troops dressed up in sheepskins for camouflage in the snow, and stormed Soviet machine-gun posts with curved swords at a short range and defeated a Soviet pincer attack. Casualties were getting heavy on both sides before Ma Zhongying ordered a retreat.