But after crossing into this world, Zhou Lang knew.

Under the constraints of today's technological and artificial conditions.

Building a catapult is not an easy task.

Not to mention the very high requirements for manufacturing technology and manufacturing materials.

The catapults in Da Zhou today are all pulled by human power to throw stones out.

For example, a martial arts classic in the Song Dynasty is always in the middle.

......

Chapter 1253 of "Zhenguo Silly Shizi" Zhangzhou City, something really happened! I am hitting it in my hand, please wait a moment,

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