Hello. My great-grandfather, Charles Otto Bartz, served in the Army during the Great War. While researching his time served there, I found him on two passenger lists that show some conflicting information.
On the first list, it lists him in the 4th Pioneer Infantry, Company H. On his return from France, he's listed as part of the 113th Infantry, Company M. Was it common during this war for solders to move to different infantries, or could this be an error somewhere? If he was really part of two infantries I would like to confirm this as this would help me understand where he may have fought during his time served. Thank you for your help!