The Battle of Tutung (Chinese: 頭屯河戰役) of 1934 occurred when Gen. Ma Zhongying's Chinese Muslim36th Division was attacked by the Soviet Red Army on the banks of the frozen Tutung River [zh]. The battle took place over several days, and Soviet bombers used mustard gas.[1] 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.[2][3]