Beautiful, but unrealistic. There have been a lot of examples throughout History of heroic defenders that resisted to their last breath... only to be slaughtered in the end. Sure, the will to win plays a great part in war, but it's nothing compared to numbers, technology and strategy. Germany had two of these three elements on their side at the beginning of the war and that is why they fared so well. But in the end they were being gangbanged, badly. That, the development of countermeasures to their "Blitzkrieg" tactics, and the supply shortages they suffered are what ultimately tipped the balance of the war.