Rita,
I don't know much more about Henry born in 1755. Nicholas Dehoff, brother of Anna Maria, moved to Maryland at the same time Johannes Hergereder disappeared from Berks Co, Pennsylvania.
http://hometown.aol.com/midmdroots/carroll/cemeteries/winter...Burial information for Johannes and Maria -- this is only 15-20 miles from Woodstown where Nicholas Dehoff relocated after leaving Berks County.
1790 in Frederick County, Maryland -- Henry Hargwager (1 male over 16, 2 females) is only a few families away from Henry Dahoof (2 males over 16, 2 females). I am not positive who this Henry Dahoof is, but we believe that Nicholas Dehoff of Berks County was related in some way to the DeHoffs of York Co, Pennsylvania and Frederick and Carroll Counties in Maryland.
I hope this helps...here is my DeHoff website although Nicholas is not mentioned there (he is another branch of the tree).
http://homepages.rootsweb.com/~dehoff/dehoff/index.htm