Hess was promoted to platoon leader of the 10th Company of the 18th Bavarian Reserve Infantry Regiment, which was serving in Romania. He was wounded on 23 July and again on 8 August 1917; the first injury was a shell splinter to the left arm, which was dressed in the field, but the second was a bullet wound that entered the upper chest near the armpit and exited near his spinal column, leaving a pea-sized entry wound and a cherry stone-sized exit wound on his back.[7] By 20 August he was well enough to travel, so he was sent to hospital in Hungary and eventually back to Germany, where he recovered in hospital in Meissen.