The movie obviously wanted to impress audience with how dangerous the situation was. But it tried to do it by twisting the historical facts. You see destroyers after destroyers bombed to sink without firing a single anti-aircraft round. They must have all been manned by blind and deaf soldiers. We all know destroyers were designed to have two major tasks: anti submarine and anti aircraft for the fleet, protecting the aircraft carriers. In real life it would have put up a hell of anti aircraft lead against the approaching German bombers. They may have been sunk, but not without a hectic fight.

For audience that have no knowledge on WWI topics, this is really impressive on how brave our ancestors had fought in how dangerous situations. But for anyone who knows a bit of history, you just laugh. It was like a grandpa bragging "I was alone tasked to defend the whole town and 25 Tigers and 5000 SS troopers attacked me and I defeated all of them..."