Firearms Became King In The Late Ming Dynasty

In the late Ming Dynasty, the emperor was busy and slave-building was rampant. Sit on the artillery city and guard the border wall with cavalry.
Millions of hungry people are roaming the mountains and fields, and the villagers are brave enough to stop them. The barbarian chieftains and pirates joined in the fun, and they surrendered those who could.
Enemies from all walks of life are coming, and the empire is trapped in fire and ice.
At this time...
A strange army rose quietly, it was Jin Shiqi's firearms army, applause!
He understands technology, works diligently in farming, and is good at making money. He unified the small family, governed the feudal territories, and conquered the world.
Jin Shiqi, the former physics teacher and now the general of the border army: "Now that we are here, the earth will be turned upside down!"