User blog comment:IamJakuhoRaikoben/Chapter 449: Mavis & Zeref, Review./@comment-24102956-20150824074955/@comment-7418318-20150824162308

Or Virgin Witch Maria/Junketsu no Maria. There you have that exact scenario, since it takes the real-world 30 year war and tosses a few witches and their familiars into the mix.

Not the best of animes alltogether, but still quite enjoyable. And surprisingly it's also historically very accurate... except for the magic of course. But as far as clothes, armour, weapons, fighting-styles and such goes it's one of the, if not the, most accurate anime ever... certainly the most accurate I've ever seen.