Liu Hong's army behind him made way. The three thousand armored soldiers brought by Bai Qingyan advanced rapidly.
At Zhao Ran's command, the soldiers of Niujiao Mountain shouted and changed formations. Each group of six men, with four carrying light shields in front, three of which had different shapes. The middle one was a square-shaped light shield with four equal edges, while the sides were triangular shields with three equal edges. The ones at the back carried normal shields, protecting two soldiers with backpacks within. They moved steadily and quickly towards the two corners of the city wall.
Liu Hong watched the six-man groups, each with different-shaped shields, and was puzzled about their purpose.
"Duke Bai, what is the use of these shields in the hands of the six-man teams?" Liu Hong asked.
"Six men per team, with three of the shields carrying hidden clasps that interlock into a single unit. General Liu will see soon enough," Bai Qingyan replied.
