As was the custom of the time, it signed a treaty with several German Principalities to essentially lease their armies for the duration.

Von Trümbach/Bose participated in many of the major events of the war, including the actions in New York, Stono Ferry, Eutaw Spirings, Savannah, Charleston, Guilford Courthouse and Yorktown.

At Guilford Courthouse the regiment received special note for its bravery as they fought back-to-back to battle foes on both sides.

The main body of the regiment surrendered with Cornwallis's army at Yorktown.

The Grenadier company remained in New York and returned to Hesse Cassel from there.