In the 1930s, Germany and China national government carried out extensive and in depth cooperation in the military field. German military experts with "private capacity" were employed by the China government in order to help taking steps to train the armed forces, contacting military purchases, building a modern military education and even directly involving in the command of the war against Japan. Through the military trade between Germany and China, China got a lot of advanced weapons in the early difficult international environment, whereby the national government is equipped with a number of German troops in the early days of the war against Japan, which played a huge role in the front of battlefield.