Research on the Relation between Feng Yu-xiang and Chiang Kai-shek during the Anti-Japanese War

From brothers to enemies,the relation between Feng Yu-xiang and Chiang Kai-shek changed frequently.They got well on with each other during the Anti-Japanese War when being esteemed by Chiang,Feng obeyed the latter's leadership.At the critical moment of nation,Feng encouraged continuously Chiang to have determination to fight against the Japanese invasion,reminded him of showing his leadership and dignity.Meanwhile,he also criticized Chiang's work.Feng had a great contribution in the war.Feng's obedience and support originated from Chiang's persistence in fighting against the Japanese troops.After victory,Chiang turned to the civil war,which led to their different political opinions,and went their own ways ultimately.