In the history of US-China wartime relations, the Stilwell Incident has become 'hard evidence' that the Nationalist Government had no intention of fighting against Japan and would exploit Allied resources to expand its strength. Interestingly enough, Stilwell's successor, Albert C. Wedemeyer, despite taking command in a difficult and awkward situation, succeeded in strengthening the Nationalist armies to fight the Japanese and kept Sino-American relations out of a state of crisis. With the availability of Chiang Kai-shek's newly-released diaries and the Wedemeyer Papers, historians are now in a good position to explore how and why Wedemeyer could successfully fulfill his mission. The basis of Wedemeyer's success becomes clear upon close examination of his perception of and attitude toward the Chinese situation and of his dealings with Chiang Kai-shek, the ongoing offensive of the Japanese troops, and KMT-CCP conflicts. Wedemeyer's case provides insight into the nature of the US-China wartime relationship.