His Sky Fleet was currently scattered across the continent on garrison duty and could not assemble in an instant.
To ensure nothing went wrong, Qin Feng first had to withdraw all the Ancient Giant Dragons and Royal Dragon Cavalry from their respective defensive zones, have them assemble in the Northern Forest, and then rush to the Northern Territory at full speed. Because of this, the reinforcements would not be able to arrive right away.
Thus, the heavy burden of slowing the enemy's advance fell upon Arthas. He had to protect the various Sub-human Indigenous People living in the Northern Forest—these unarmed subjects of the Holy Empire could not be caught in the crossfire. Time had to be bought for them to evacuate or take cover before the enemy arrived.
Fortunately, Arthas was far more proactive than expected; he was incredibly swift.
