 If you liked
Gunka no Baltzar
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 ...then you might like
Nejimaki Seirei Senki: Tenkyou no Alderamin
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Both involve Military Strategy and Politics. With focus on intellect rather than pure brawn. The MC in both mangas are placed in a peculiar position in the military (double agents?), surrounded by subordinates and equals. Both Protags are tacticians and sharp making for a good read. Although Nejimaki is colored with some fantasy - it does bring out military skirmishes interestingly.