That was an army of four hundred thousand, yet it was so easily taken down by North Country, which was obviously somewhat off. Therefore, the Yue Emperor had the spies of Da Yue Dynasty try every means to gather information about the military of North Country, and eventually, they did indeed uncover some rumors regarding the North Country army.
It was said that North Country's army could summon lightning and thunder. During the defense of Yan County, the Sky Wolf King's forces were defeated by North Country's army with the power of Heavenly Thunder.
Naturally, the Yue Emperor did not believe such rumors, and she continued to have Da Yue's spies investigate whether North Country possessed any mysterious weapons. This investigation actually led to the discovery of the names of North Country's new weapons, such as "Thunderous," "Mo Xing's Firearm," and "Mortars" were all uncovered by Da Yue's spies.