In the centuries since the Revolutionary War, French contributions have been criminally downplayed. Somewhere between the real Yorktown and Mel Gibson's rather less accurate version, The Patriot, the monumental French war effort during the birth of America got forgotten, buried in the sand, and pissed on.
The truth is, the 13 colonies would never have earned their freedom without French intervention -- the whole battle for American independence was essentially a proxy war between Britain and France. To the French, America was nothing but another theater in their grand blood feud against Britain. They were all about making the Englishmen eat every last available dick, and since they noticed they could use the colonists' struggle for independence as a handy feeding pen, that's exactly what they did.
France began providing arms and ammunition as early as 1776 (the war started in 1775). In early 1777, months before Saratoga, the French sent American colonists 25,000 uniforms and pairs of boots, hundreds of cannons, and thousands of muskets -- all stuff that the colonists would've had a hard time surviving without, and all stuff they had no access to on their own. And that was just the tip of the iceberg: From supplies to advice to military reinforcements, France exercised all the fiscal restraint of a drunk businessman at a strip club when it came to funding the American war.