How did the Mongols use siege warfare in their conquests? by sailing up to a coastal city and firing cannons at it for many days
O by surrounding a city and preventing anything from getting in or out
O by sending so many troops into battle that the enemy was outnumbered
O by setting up points on hilltops where the enemy's movements could be watched

its b) by surrounding a city and preventing anything from getting in or out

Explanation:

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