Ming Dynasty: My Massive Warships and Big Cannons

This book: The protagonist travels with an ironclad coast guard ship to the late Ming dynasty; the ironclad coast guard ship also carries some modern weapons. By relying on advanced weapons and knowledge, he contends for supremacy in the late Ming, changes the dynasty, resists foreign invasion, kills all the Japanese pirates, ranges across the oceans, and wages war around the world. Strategy + ironclad ship + artillery + no system.