C250 Sentinel himself to force the city open

Yun Zihuang was slightly startled, he slowly raised the order in his hand: "Academy Officer Yun Zihuang, in accordance to Grand Commander Ouyang's order, send troops to Black Bear Valley, I ask Mr. Yu to open the city gates."

Yu Chou frowned, he stared at the order in princess's hand, how was this possible?

Why would the Grand Commander give such an order?

One thousand men