The Continental Army put Beaumarchais' supplies to good use. The defeat of General Johnny Burgoyne and his army on October 17, 1777, to Horatio Gates at Saratoga, was a major turning point in the American Revolutionary War. It was won by American soldiers, even if 90% of the gunpowder used had been supplied by and paid for by France, and was used in French M 1763-66 pattern (Charleville) muskets, which by then had become standard in the Continental Army. The victory at Saratoga proved to the French that the American rebellion could be sustained with a possibility of success.
News of Burgoyne's capitulation reached Paris in the evening of December 4, 1777; on the 17th Vergennes promised to recognize the independence of the Thirteen Colonies, with or without Spanish support. On January 30, the king authorized the Secrétaire du Conseil d'Etat Conrad Alexandre Gérard to sign the Treaty of Amity and Commerce and a secret Treaty of Alliance on his behalf. On February 6, 1778,Gérard carried out the order and Deane, Franklin, and Lee signed for the United States.
By these treaties, France offered "to maintain … the liberty, sovereignty, and independence" of the United States in case of war between her and Great Britain. France promised to fight on until the independence of the United States was guaranteed in a peace treaty. All the United States had to do in exchange was not "conclude either truce or peace with Great Britain without the formal consent of the other first obtained.
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