Tell me about that one - who directed it and why you liked it.
It was Peter Jackson, who was commissioned by the Imperial War Museum (btw I just visited there when I was in London, highly recommend it!)
He took old footage and colorized it and normalized the speed so it looks like it was shot recently. Added in commentary from the men who fought during the war. It really brought it to life like nothing before. I found myself tearing up a few times during the movie.