Zhou Tian had the confidence to find a glimmer of hope under the revenge of the Undead Overlord. What he mainly depended on was his own large army of Beastmen. If he didn't rely on the strength of the entire Beastman Tribe for resistance, Zhou Tian wouldn't dare guarantee that he could survive under the hands of those Undead Monsters, who could easily possess hundreds of levels of strength.
Under such circumstances, it's not surprising that Zhou Tian did not dare to send his troops out again.
If he were to embark on an expedition, the attention of his large army would inevitably fall on the opponents. At that time, if he didn't act, it would be fine. But if those Undead Monsters took action, even the slightest exposing of a weakness by Zhou Tian could potentially cost him his life.
But is it possible not to show any weakness on the battlefield?