There were already suggestions at the time, notably from French author Jules Roy, that Admiral Radford had discussed with the French the possibility of using tactical nuclear weapons in support of the French garrison. Moreover, Dulles reportedly mentioned the possibility of lending atomic bombs to the French for use at Điện Biên Phủ in April, Dulles tried to put more pressure on the British, and asked Eden for British support for American air action to save Dien Bien Phu. Eden refused, which enraged Dulles; however, Eisenhower relented. The President felt that, along with the political risks, airstrikes alone would not decide the battle, and did not want to escalate U.S. involvement by using American pilots. "Nobody is more opposed to intervention than I am".