US Army 13th infantry

This is all i have on my Grandfather Srgt Henry M Barry. His Obit. says he was in the 13th Infantry in the army in Europe. I know he was wounded in Germany. He left Boston harbor July 1st 1942. He had stated he was in Duren at some point and also had to cross the roer river where there was heavy fighting. And at some point they had found a German officer in a cottage in the peninsular of crozon. I dont know if this information will help somebody to help me find out what unit he was with. Can anyone help?