First this is a Hollywood adaption, it is not a documentary, it is not meant to show the British, Americans nor Canadians did more or less. It is a adaption of a novel. and one man and several directors interpretation of the D Day invasion. It was entertaining, showing both sides of the invasion, the Germans and the allies. War is flawed, mistakes are made on both sides, and the allies were successful , Omaha Beach suffered the highest casualties for many reasons and was thus portrayed as the main focus of the movie.