Firstly, this is a drama and not a documentary. Admiral Lutjens was not a rabid Nazis and nor a headstrong glory hunter but making him into one helped create a sense of tension between he and the more circumspect Captain of Bismark. You can be the judge of whether this was a good choice for enhancing the drama at the cost of historical inaccuracy. It's a bit like Shakespeare making Richard III a hunchback to give him greater motivation though Richard's deformity was a genuine case of fake news. The film is tight, tense and extremely well acted by a cast of class actors. The battle scenes are brilliantly handled so it is no surprise that Lewis Gilbert was called upon to direct action films with bigger budgets in the later 60's. But Gilbert was also a master of personal revelation and development scenes such as those between Moore and Wynter. Even as a boy with action on my mind, I was moved and informed by these scenes. Wynter as Davis conveys a sense of remorseful contemplation as the news of Bismark's imminent demise is received in the situation room rather than any sense of undue satisfaction. These people were doing their duty and their job and did not glory in the destruction it entailed. There is much to admire in this film.
Review of Sink the Bismarck!
