As a Reincarnated Aristocrat, I'll Use My Appraisal Skill to Rise in the World 12 (manga)

Ars's brilliant strategic skills lead his team to victory, having captured Castles Samkh, Rolto, and now Staatz. With the dead of winter fast approaching, Ars is determined to take over the city of Velsdht itself so they can secure an incredible advantage in the war to come. In order to win this next fight, however, they will have to face off against Tomas Grandione… And when a messenger arrives from the Count of Velsdht, seeking a truce, Ars realizes there is more at play here than meets the eye.

Volume 12 of the As a Reincarnated Aristocrat, I'll Use My Appraisal Skill to Rise in the World manga series by Natsumi Inoue.