The death of the Demon Prince is the key to the battle.
Another key point was that within a short span of six months, they caused huge casualties to this Demon Army. They rammed into the Alliance's defense line and launched a frenzied assault, all the while suffering significant losses themselves.
With their leader dead and massive casualties, these two factors combined meant that even if the Slaughter Demon Army wanted to continue fighting, they had already lost their offensive capability and ultimately had to retreat unwillingly.
But on another note, the forces that the Alliance entrusted to Delieu were a tremendously large power.
Not only were the defense forces from regions like Liao Guang and Gucheng in the northern part of the Alliance given to him, but Gu Hang also assigned a powerful corps to him. The naval and land forces were both abundant.
