No need to mention the battle on the Blood Moon Lord's side. When two evenly matched forces are in conflict, if one side has a leader and the other does not, then it isn't just about the strength of the Blood Moon Lord, but the fact that the lack of leadership alone is enough to determine the defeat of the undead army.
And what comes next would naturally be resolved quite easily.
As long as Zhou Tian could kill the Undead Overlord, then this operation to annex his forces in alliance with the Blood Moon Lord could be successfully completed.
Although the war on the Blood Moon Lord's side was intense, the true outcome of this war still depended on Zhou Tian's actions.