Saxon infantry wearing dunkelblau uniforms, 2 1-year volunteers can be seen (white and green piping can be seen) "Dear parents! Have received your letter, but unfortunately I can’t come. I have been commandeered as the assistant-cook of the non-commissioned officer’s course. I have been working there for 4 weeks already. I have to get up every morning at 03.30hrs, and can’t leave until 20.30hrs at night. By that time I’m happy to go to sleep. So you can understand I can’t come. Best regards from your [Wilhelm?]" Writing on the photo says "A bunch of old bones!" One soldier has been highlighted on the photo with a red crayon or something similar, a red square around his head, but it doesn't show up well in a greyscale scan(2nd from the left, bottom row, holding his gun pointed upwards.) The highlighted soldier could be the sender.
1914, world war one