Surrender of General Burgoyne at the Battle of Saratoga, by John Trumbull, 1822.
A British army was captured at the Battle of Saratoga in late 1777 and in its aftermath, the French openly entered the war as allies of the United States. Estimates place the percentage of French supplied arms to the Americans in the Saratoga campaign up to 90%.
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"1280px-Surrender_of_General_Burgoyne.jpg."
https://en.wikipedia.org/wiki/France_in_the_American_Revolutionary_War#/media/File:Surrender_of_General_Burgoyne.jpg
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