who helps Henry and what does he do for him?

Soon after being injured, Henry hears a voice over his shoulder, asking him cheerily how he is. Henry only replies with a grunt. The other man offers to go along with him, and helps him along as they walk. The other man talks constantly about the battle, saying that there was so much fighting he could not tell what side he was on. He also tells a story of a soldier in his unit that was shot in the head in the process of telling someone to go to hell. The cheery man takes Henry through all kinds of forests in the dark. Eventually, he leads him to his regiment, which he had left so long ago. The cheery man departs, wishing Henry luck. The youth then realizes that, in the dark, he never once saw the man's face.