"After the Demon Slaying Emperor was captured, Emperor Bai Zang easily suppressed the entire Demon Slaying Branch. It was later discovered that they were also holding other members of the Forbidden Demon Clan captive within the branch.
With Emperor Bai Zang's abilities, as long as they weren't Emperor-Level Forbidden Demons, there wouldn't be any issues. Where could these Forbidden Demons escape to? All of them were captured alive by Emperor Bai Zang, and only two or three demons seemed difficult to deal with and were personally killed by him.
Regardless, this was excellent news. The morale of the human side increased greatly without having to engage in battle first.