2 results
The Rising of the Commoner-Origin Officer: Beat up All the Incompetent Noble Superiors!
Heimin Shusshin no Teikoku Shoukan, Munou na Kizoku Joukan wo Juurin Shite Nariagaru· 平民出身の帝国将官、無能な貴族上官を蹂躙して成り上がる
manga

All the bosses are annoying! The reincarnated strongest magician's trampling and subjugation begins! Hazen Heim, a newly appointed imperial general, is demoted to the front line because he is a commoner. There were a lot of incompetent people, such as "a trash superior who takes advantage of his position to steal the achievements of his subordinates", "an evil subordinate who keeps bullying people below him", and "a top who is too opportunistic to do anything''. However, Hazen has the experience and overwhelming ability as the strongest magician that he cultivated in his previous life. He slaughters his subordinates in accordance with military law, and completely refutes his superiors who complain. He achieved extraordinary results, such as making peace with a hostile tribe by teaming up with a genius girl, and defeated all the annoying bosses! An exhilarating upstart fantasy about an unscrupulous superior.

Rise of the Lowborn: Ascending the Ranks by Crushing Incompetent Nobles
Heimin Shusshin no Teikoku Shoukan, Munou na Kizoku Joukan wo Juurin Shite Nariagaru· 平民出身の帝国将官、無能な貴族上官を蹂躙して成り上がる
novel

*Time to tip the scales.* Hazen Heim is a newly appointed imperial military officer who had the poor luck of being born without a silver spoon in his mouth. This means that instead of landing a cushy nepotism gig, he’s getting sent to the front lines to deal with the worst of the worst. Awaiting him are scumbag supervisors who constantly steal credit, low-life leaders who love to abuse their power, and bumbling members of the brass who have never had to make a hard decision once in their lives. Fortunately, Hazen racked up decades of knowledge and experience in his past life as a legendary mage. Now it’s his turn to put the tyrants in their place, and they’re going to learn that when they go low, he goes lower… (Source: Yen Press)