Battle of Wuhan
As the War of Resistance raged on after the Fall of Shanghai, Nanking and Taiyuan at the end of 1937, new main battle lines were immediately drawn at the Battle of Wuhan, Battle of Taierzhuang, Battle of Canton, and the ROCAF received its primary support through the Sino-Soviet Non-Aggression Pact of 1937, along with the support of the Soviet Volunteer Group, from 1937 to 1939 in return for raw materials.