About 18,000 Hessian troops arrived in the Thirteen Colonies in 1776, with more coming in later. They first landed at Staten Island on August 15, 1776. Their first engagement was in the Battle of Long Island. The Hessians fought in almost every battle, although after 1777, the British used them mainly as garrison troops. An assortment of Hessians fought in the battles and campaigns in the southern states during 1778–80 (including Guilford Courthouse), and two regiments fought at the Siege of Yorktown in 1781.
After the war ended in 1783, some 17,313 Hessian soldiers returned to their homelands. Of the 12,526 who did not return, about 7,700 had died. Some 1,200 were killed in action and 6,354 died from illness or accidents, mostly the former. Approximately 5,000 Hessians settled in North America, both in the United States and Canada. In some cases, their commanders refused to take them back to Germany because they were criminals or physically unfit. Most of the men married and settled amongst the population of the newly formed United States.
Christian would have been only 20 in 1783 when the war ended. Seems unlikely to be a Hessian. Does anyone have more information?