why does henry wish he had a wound ? would you feel the same way in his situation (as one of the few uninjured?) where do you first find the phrase "red badge of courage" and what does it mean here?

Henry wishes that he had a red badge of courage (a wound) like many of the other more seasoned soldiers. He sees the injured soldiers around him and wishes he had something to show from battle. Henry becomes wounded when he stops a fleeing soldier. The soldier (on his own side) hits him in the head with the butt of his rifle. The irony is that Henry didn't get his "badge" in battle but from a fellow soldier running away in terror.