Although my question doesn't concern my own genealogy I hope I can get some help or advice at this site.
I do a lot of research in Dutch archives especially on interned German soldiers and deserters and found a Hauptmann Karl Stephan who was wounded during the attack of his unit on Fort Pontisse near Liège. The Dutch Red Cross brought him to Holland where he eventually ended up in enternment .
His regiment was the Grossherzoglich Füselier Regimt Nr. 90 Kaiser Wilhelm.
I would like to find out more about him. Maybe a picture of him in uniform and or military record.
But I have no experience in searching German record..