Calling A Friend Across Time And Space 

Lilith, Raizel, and Cathy were watching the battle through a projection inside the Black Tower. They saw how William was unable to get the upper hand in his clash against Morax.

The battle on the ground and air however, was the complete opposite of what was happening in the fight between the leaders of the two sides.

William's Thousand Beast Army had the upper hand because, not only did they have quantity, they had quality as well. 

The Undead Army's ranks were pretty chaotic, which ranged from Class D Monsters up to Millennial Beasts (Bone Dragons).

The weakest on the Demonic Legion's side, on the other hand, were class A Monsters with several Millennial Demonic Commanders ordering them.

If these combined forces were to attack a Kingdom then the outcome would be total annihilation.

This was also why Eldon and Swiper had almost lost all hope when the Demonic Legion arrived on the battlefield to aid Morax in this battle for dominion.