As a Reincarnated Aristocrat, I'll Use My Appraisal Skill to Rise in the World 6(manga)

The war of succession is in full swing, Ars having recently uncovered Prince Vasmarque's ruse. Ars then sets about finding new vassals for Prince Couran's camp, soon stumbling upon a foul-mouthed, heavy-drinking woman named Mireille. Though Mireille's skills rival even Rietz's, Ars decides to test his new find by staging a mock battle. With Mireille leading one side and Rietz the other, the clash is sure to be nothing short of explosive.

Volume 6 of the As a Reincarnated Aristocrat, I'll Use My Appraisal Skill to Rise in the World manga series by Natsumi Inoue.