A friend told me about this a few years ago, and tonight my dad reminded me of it: British soldiers weren't the only soldiers fighting for the Crown in the American Revolutionary War. Troops from Germany were also brought over. These soldiers were called the Hessians.
So how did England get Germany to fight with them? An alliance? Kinda. George the Third was the King of Great Britain during the war. His grandfather George the First was actually German and only ruled because England didn't want a Catholic on the throne. Great Britain was officially Protestant at the time, and the first non-Catholic successor to the throne at Queen Anne was German George. So that's how the English were able to call on German troops sixty-two years later.