Bright Sword: Old Li, You're Not Short on Weapons Anymore!

A military industry PhD transmigrates to 1940, collapses in a ditch, and is picked up by the Independent Regiment. When Li Yunlong hears he's an intellectual, he curls his lip. “A bookworm? What's the use of that?”

Three days later, Chen Jingyu turns a Japanese shell casing into a mortar and blows up a blockhouse with a single shot.

Old Li: “That shit sure smells good!”