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.