International marketing is misleading
The poster and trailer in this article (http://www.flickeringmyth.com/2015/06/trailer-for-admiral-starring-charles-dance-and-rutger-hauer.html) are suggesting Charles Dance is the lead in this film. He's actually only in a couple of scenes, as most of the film revolves around De Ruyter who is portrayed by Frank Lammers. Dance isn't even in the Dutch poster, but has been clumsily chopped into the international one (in front of Lammers even, which is a bit insulting to be honest). It's like making Andy Serkis the lead star of Age of Ultron.
Also, you might want to know that, unless they're dubbing the film, most of it is in Dutch. No problem if you don't mind reading subtitles, but the trailer pretty much edits together most of the actual English dialogue in the film. There's a couple of scenes in English, one or two in French, and the rest of it is in Dutch.
The film itself is okay; not great but an impressive historical epic considering its low budget (which, at 8 million euros, is very high in the Netherands, but it's a small country after all). Just don't walk in expecting some British epic starring Charles Dance. He's in it, but only in a supporting role. Same goes for Rutger Hauer.