In 1934, 2 brigades of Soviet Gosudarstvennoye Politicheskoye Upravlenie (GPU) troops of about 7,000 backed by tanks, planes, and artillery with mustard gas, attacked the 36th division near Tutung. The battle raged for several weeks on the Tutung frozen river. 36th division troops dressed up in sheepskins in the snow, and charged Soviet machine gun posts with swords to defeat a Soviet pincer attack.