I'm reading kingdom and I absolutely love to see the huge battles portrayed
Does anyone know or more manga that feature large scale battles and wars?
arslan senki perhaps?
Maybe Madan no Ou to Vanadis. The anime was meh, but there was a lot of strategy discussion involved, so maybe the manga is your thing.
Gate is good
Gunka no Baltzar and Historie (this last one takes a while to pick up, but it's worth it).