George is gallant in the way of being self sacrificing because he gives up being able to pursue his dream in order to look after his friend. They were by a river on their way to their new job and George becomes mad at Lennie. He burst out with "God almighty if I was alone I could live so easy. I could get a job'n work, no trouble at all." George
is defeated in the sense that hes being held back by Lennie, he gives up his dreams which he is capable of perusing to look after Lennie's well being . But George overcomes it by sticking through it and spends basically his whole life being a babysitter and taking the risk of getting in a lot of trouble because of Lennie's childish behaviors. After Lennie just killed Curley's wife and is on the run, George gets to him first and talks to him. He takes a gun and shoots Lennie in the back of the head, killing him. It was hard for George to do but he had to do it because he was either going to get tortured by Curley, or put in a jail where he wouldn't be happy at all. It was a gallant act for George because this was a person which he cared about and was given a responsibility by Lennie's aunt to look after...