https://play.google.com/store/books/details?id=MoIOAwAAQBAJ
I've never been sure how to sum up these books. They're thoroughly strange fantasy books, oddly written and frequently chewy reads. They have an interest in politics and metaphysics; but they also have magical railguns, the sorcerous application of FOOF [1], and a five-ton battle-sheep named Eustace.
The first book is fairly straightforward: A quiet backwater of the Commonweal is under threat, and its only defense is an understrength territorial battalion, a handful of experimental artillery pieces, and three of the mightiest sorcerers of the age.
Then the second book (A Succession of Bad Days) isn't at all about the military, and is more like the weirdest going-to-sorcery-school book I've ever read. It also has an extended, detailed section on using sorcery in canal construction. If you ever wanted a book about the best ways to use magic in the service of civil engineering, this series is your jam.
These books really aren't for everyone, but I kind of love them, and they aren't widely known, so I'll always take an opportunity to shill them.
[1] https://www.science.org/content/blog-post/things-i-won-t-wor...