Summary: The Definitive Guide to the War of Princes
Comment: Tactics, siegecraft, naval battle... its all described in this "war book" for the new Dark Ages line from White Wolf.
Just in case you are figuring that you don't plan to play Vampire, but are in the mood for another DA game, be it Mage, Inquisitor, or Werewolf; they have rules for all of them here too.
Frankly it is a brilliant move that is way to long in the coming: put out a source book that covers your entire spread of books. Not one book of combat abilities for each character type you have available to you.
This book delivers what it promises to: how to make war in the Dark Ages, particularly against other supernatural opponents.