Li Yuanqing left first when he heard the loud noise outside. He flew above the library and looked into the distance. The library was built very high, and it was located in a top-notch place in the entire city. From here, one could see the city wall outside.
A huge flame erupted from the southern city wall, causing it to rumble and even create a small gap.
This city wall had been reinforced a few times. There was no need to say anything about its current sturdiness. However, even though the city wall had been reinforced so many times, there was still a gap under the attack of the huge artillery.
Fortunately, the accuracy of the cannons did not seem to be particularly good. After smashing one place, they scattered elsewhere, causing the city wall to be constantly bombarded. However, there were also many engineers below who kept repairing the gap. Therefore, the two sides formed a very delicate balance.