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Declassified per Executive Order 13526, Section 3.3 NND Project Number: NND 63316. By: NWD Date: 2011 TOP SECRET – Sensitive preconditions for United States intervention, and contended that if Dien Bien Phu fell there was no reason that this should make it necessary to plead for a cease-fire. The French Foreign Minister, in a letter limited to the military consequences of United States intervention, replied that in the opinion of French military experts "a massive intervention of American aviation would still be able to save the garrison."


 * b.

In the discussions with the British, meanwhile, the United States had tried both to induce the United Kingdom to participate in a joint Anglo–American air and naval intervention at Dien Bien Phu and to persuade the United Kingdom that the prompt organisation of a collective defense in Southeast Asia was necessary to bolster the French in Indochina.

But the British indicated that they would make no commitment to intervene militarily in Indochina and wished to postpone conversations on collective defense arrangements until after the Geneva Conference. Foreign Secretary Eden told Secretary Dulles on April 24 that the British did not want at this juncture to intervene in the Indochina War. Immediately afterward Eden returned to London for a special Cabinet meeting on the Indochina crisis which was held on April 25. Prime Minister Churchill reported to the House of Commons two days later that the British Government was "not prepared to give any undertakings about United Kingdom military action in Indochina in advance of the results of Geneva," and had "not entered into any new political or military commitments." Before addressing the Commons, Churchill had rejected a plea from French Ambassador René Massigli, made on behalf of Premier Laniel, for a statement that Great Britain would join the United States and France in defense of Dien Bien Phu.

The United Kingdom was willing, however, to participate in early military discussions to consider measures which might be taken in Southeast Asia if Indochina was lost. Along these lines, Foreign Secretary Eden and Secretary Dulles had discussed tentatively on April 22 the possibility of a secret military appraisal — by the United States, the United Kingdom, Australia, New Zealand and Thailand — of what could be done to bolster Thailand in the event of a French collapse in Indochina. The Foreign Secretary had returned to this proposition in another conversation with Secretary Dulles the next day.

On April 30, indicating that the British were prepared to defend the area outside Indochina, and possibly the free part of a partitioned Indochina, Eden proposed to Secretary Dulles "an immediate and secret joint examination of the political and military problems in creating a collective defense for Southeast Asia, namely: (a) nature and purpose; (b) membership; (c) commitments." He added that this examination should also cover immediate measures to strengthen Thailand. Rh