This is one of my favorite manga to this day: Kingdom by Yasuhisa Hara
It was released in Shueisha's seinen manga magazine Weekly Young Jump since January 2006.
It's a story where China is divided, constant wars and corruption from their politicians, leaders, and governments until a young boy name Ei Sei become the next king of Qin and has a goal to unite all of China but to accomplish this, he needs a lot of great generals and army to let that happen including the main character; Shin who fights to unite the people of China and become the greatest general who ever lived.
Now it has humor like any Shonen Jump series but it is very bloody, gruesome and the details, the battles, its stories
is what got me interested in it.
Instead of showing power-scaling, they show how enormous these characters are.
And it also inspired me to make my comic: "Mukhtar". The way he make the details of strategy is what inspired me.
If your interested, try it out. It maybe worth reading for you.
https://ww2.readkingdom.com/manga/kingdom/