Who were the hessian mercenaries?

the hessians were professional soldiers that were hired to fight for britain that needed mercenaries

"Hessian" is a name given to all German troops deployed by the Crown Forces during the American War of Independence (most were from the German state of Hess). They were auxilliary troops who were "rented" out by their rulers, a fairly common military practice in 18th century Europe. King George III was of German descent and had family loyalties with some of the German princes, who loaned their troops to Britain.