Good idea. My aunt told me he was a horse soldier (cavalry) during the Boer War. There were two Boer Wars, the second one would have been after he had emigrated to the US and established a second family and home. I couldn't find any official German military involvement in the first Boer War but perhaps he was some kind of mercenary. He was from Dernbach/Ramback in Rheinland Pfalz., which was considered part of Bavaria at the time.
Thanks for your suggestions.