Answer:
Gunpowder bombs, and smart engineers.
Step-by-step explanation:
Genghis Khan realized his best chance of conquering China was by attacking its major cities and forts. His engineers made a very advanced siege engine called trebuchet. It had nearly a range of 1,000ft. The Mongols used the weapon to hurl gunpowder bombs over the city walls. No Chinese weapon was as powerful as that.