WI the initial fiascos faced by US and UN forces in Korea after the NK invasion in June 1950, had resulted in a total rout, say to the extent of the Pusan perimeter being breached, the US, ROK and British Cth forces being overrun, and the compelled non-Communist evacuation to Japan ? Could the US and allies have been compelled to accept some sorta Dien Bien Phu-like settlement with the Reds, or would Truman and MacArthur simply have wanted to have gone on fighting ?