This 4 page letter reveals a very interesting look at the thoughts of President Eisenhower on the involvement of France in Vietnam, in 1954. He made a very interesting comparison to our revolution, and the situation in Vietnam.
Noting that the when the entire Colonial force numbered about 25,000, the British had Loyalists (Americans who were on their side) working for them, numbering 50,000. Of this he said "In any event, any nation that intervenes in a civil war can scarcely expect to win unless the side in whose favor it intervenes posses a high morale based upon a war purpose or cause in which it believes."
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Source: National Archives, from Collection DDE-EPRES: Eisenhower, Dwight D.: Papers as President of the United States, 1953 - 1961