His military achievements earned him the laudatory nickname "Rommel of the East".
His New First Army was known as the "Best Army under heaven" and credited with effectively confronting Japanese troops in the 1937 Battle of Shanghai and in the Burma Campaign, 1943–1944.
Perhaps because of his foreign military training, he did not have the full confidence of Chiang Kai-shek.
Sun was relieved of battle command in the Chinese Civil War in 1946, and although he was made Commander in Chief in 1950 after the retreat of the Nationalist central government to Taiwan province, he was given only ceremonial roles.