Next, besides overseeing during the day, Pei Shu'er carefully studied ancient war essentials like the catapult.
From her previous observations, the Dazi's catapults were quite old-fashioned, requiring a lot of manpower and were easily damaged.
However, she found in a book a type of catapult that required no manpower and had significant attack power.
It was just that this type of catapult only had a simple diagram, with no other details.
Liu Xu saw Pei Shu'er frowning and thought she was worried about the city wall, so she used a silver needle to test the teapot, and when the needle didn't turn black, she poured her a bowl of water.
After this series of events, everyone was very strict about using water checks, with raw water, boiled water, and tea all being tested with a silver needle.
"Shu'er, don't rush. I see the city wall is being built slowly, but there will come a day when it's finished."
Pei Shu'er smiled, "I know, mother."
