Gate: Jieitai Kanochi nite, Kaku Tatakaeri, Drifters Recommendations
This series is somewhat similar. They both have to do with war, both being in a different world of their own. In both anime's, warriors from a different era come to this other world and fight battle of sorts and because they are from a different era, they mostly over power they're enemies.
A magic way full of fantastic characters ... But who pulls the threads?
-War between different eras
-War held in the past, not in present