@immortalartisan
https://mangadex.org/title/20430/aoi-horus-no-hitomi-dansou-no-joou-no-monogatari
Politics stuff in Ancient Egypt
https://mangadex.org/title/32962/shadows-house
It has political struggle within the manor, planning to overthrow the current ruler in trapped environtment
https://mangadex.org/title/6248/koukoku-no-shugosha
Related with war & military. yeah there is a politic too although not much, but still an entertaining story. It has a webnovel too which is still not covered within the manga
https://mangadex.org/title/8548/nobunaga-no-chef
Time travelled chef into the past. End up getting caught in Kingdom's stuff like war & politic.
https://mangadex.org/title/22933/hengoku-no-schwester
I still haven't read that far. It's basically a witch hunting period in Europe. MC here planning to overthrow the Church who has so much influence in society. It's really intense...
https://mangadex.org/title/917/gunka-no-baltzar
I really like this one too. It's mainly about military equivalent with 18th century setting and also have political struggle and strategy
https://mangadex.org/title/247/gangsta
a war between a faction, also a must read list
https://mangadex.org/title/4873/jin
Time travelled doctor to the past. He will dealing with jealous herbal practicing doctors at that time, and face many challanges
https://mangadex.org/title/22529/tokyo-revengers
Not sure about this one, but it has politic struggle in the Gang
https://mangadex.org/title/22144/issak
This one probably can fit too, general military themed stuff with historical setting
https://mangadex.org/title/44232/wa-no-kage
and this one too
https://mangadex.org/title/16825/ginga-eiyuu-densetsu
This also have war and politic stuff
https://mangadex.org/title/40277/the-chronicle-of-seven-cities
It's great but its only have a few chapter due to lack of staff from TL
