@sisio IIRC, the gramps inside Ballud's head is from the Sengoku age, and the teenage high schooler is a Japanese from the modern day who browsed Wikipedia a lot.
However, considering Ballud's defense strategy being focused squarely around multiple trench lines (that can be flooded into a miserable, muddy mess), defensible hard points such as long stone walls and what appear to be concrete pillboxes, barbed wire, open fields with no cover, and massing the medieval equivalent of heavy artillery (trebuchets) -- it seems that he's trying
really hard to recreate the miserable slog-fest that was WW1 on the Western Front within the limits of a medieval fantasy world. And if it turns out the same way then very mile, every miserable meter and foot, every
inch the kingdom of Haurelia will try to take from Ballud's Antrim, is going to be paid for in rivers of blood and the bodies of entire regiments unless they can pull out some kind of magic or mechanical monstrosity to plow their way through that many fortifications.