 Complete the following phrase:  After the Germans left, in 1938, the Soviet Union started to support the Nationalists again. The National Revolutionary Army facing Japanese forces had only a small number of armoured vehicles and mechanised troops formed into the three armoured battalions to defend a large front. In August 1937, Chiang Kai-sheks government negotiated with the Soviet government for military aid. The Soviets stepped in and began to provide advisers and tanks arrived in China for the first time in March 1938. After the Chinese armoured force was mostly destroyed in the battles for Shanghai and 