Here are two people that helped the US gain freedom
1) Marquis de Lafayette- This French general helped the young continental army in terms of structure. He helped to organize military camps, develop strategies against the British, etc.
2) Baron Von Steuben- This Prussian general showed the members of the continental army important fighting strategies like how to use a bayonet and the purpose behind guerilla warfare.
Both of these men helped the US military in their fight for freedom against Great Britain during the Revolutionary War.