A few minutes earlier….
At the eastern gate, the enemy army had already arrived. There were two layers of security at every gate: the first was dozens of soldiers at the gate, and the second was a group of archers perched high above the fortress with bows and arrows in hand. When compared to the millions of enemies wearing black robes that stood guard at the eastern gate, there weren't enough soldiers to keep the gate guarded at all.
Still, Rhesus's soldiers were also well-trained. As soon as they saw their enemies approaching, they drew their bows and arrows before glancing at their leader. As the leader of these soldiers raised his head, he stared intently at the enemies before him. A few seconds later, he opened his mouth to say: "Fire."