C547 Ling xiaotian
The gangplank was made of fine steel, and when it landed, it would heavily smash into the wall, destroying a lot of the wall. Furthermore, the front part of the gangplank had a barb made of fine steel, so as long as it was mounted on the wall, it would be very difficult for the defending army to push it away. Even if they pushed it away, a large portion of the wall would still be destroyed