MUSKET GIRLS! - TENSEI SANBOU TO SENRETSU OTOME-TACHI

I was reincarnated in an early modern war world where infantrymen in battle lines were shooting at each other after having died easily in my previous life. As a commoner second lieutenant, I was estranged from Kromberts, the god of death, because many of my men died in battle. In the midst of all this, I was assigned to the 6th Special Brigade, an all-female brigade, as a staff officer. The brigade commander, who is up to something, and the easygoing junior officers are all women, and the infantrymen are all girls who are almost amateurs. In this world, if you don't fight, you will be killed. Then I must do something about it... But how?