Sorry, I disagree. Look, he has plenty of time to watch that movie later. My NINTH GRADER had a lot of trouble watching Saving Private Ryan. I have never forgotten watching the movie Space Cowboys with my son right after he finished 4th grade - he loved watching that movie (who doesn't love Tommy Lee Jones, Donald Sutherland, all these old guys!). At the end, when the astronaut is sitting on the moon, the one who gave his life (was it Tommy Lee?), all of a sudden my son realized that he DIED, and he cried. I comforted him and told him that the Bible says that "Greater love hath no man than this, that a man lay down his life for his friends" and though it IS sad, he saved everybody. THIS kind of thing is the way to help prepare a child for much HARDER scenarios, especially the real ones, like WWII atrocities.
You may disagree with me and let him watch it. What I would ask you to think about is this: where do you go from here? If he watches the hardest stuff like this at age 11, where does he go from there?