Feldgrau.net

Does anyone have any information on a General Mack. He was the brother of my grandmother. This information was unknown to me until a few short weeks ago, when I received a photo from a cousin. All it had on the back was "Mein Bruder, General Mack - 1915". Not even sure if he served in Prussian Army, Bavarian or Baden - W. Cousin believes it was Prussian Army. Handsome devil though, looks just like me

Any info would be more than welcome. Thanks in advance.

- Hans