Seven days later.
Atop Black Iron City's walls stood hundreds of Thunderfire Divine Mechanism Crossbows, eight Heavenly Thunder Prison Cannons...
There were even several other kinds of equally powerful siege-defense weapons, distributed across Black Iron City's four walls.
The city guards of the four merged cities stood densely stationed along every wall.
At that moment, atop the northern wall.
The Dragon Emperor, the Barbarian God, Taiching Daoist, and Tongtong.
Together with the three City Lords, Liu Youfang, the Three Kings, and the others, they stood atop the wall, gazing anxiously through the crimson light barrier outside Black Iron City at the distant enemy army.
Of the four border cities, only Black Iron City remained, holding its ground.
More than a month earlier, two Saint Master realm experts had led an army in a fierce siege of Black Iron City.
With the city's multiple layers of powerful City-Protecting Grand Formations, its vast array of heavy defensive weapons, and its enormous stockpiles of resources.
And with the support of three top-tier peak Saint Warrior realm experts, including the Dragon Emperor.
They had weathered the enemy's assault through sheer force, though it had consumed tremendous resources.
Afterward, the enemy had eased its offensive, and the Saint Master realm experts had stopped taking action, greatly reducing the pressure on the city's defenses.
Meanwhile, Black Iron City had maintained intelligence exchanges with the Commandery City.
Everyone already knew everything Gu Chenfeng had done since leaving Black Iron City.
They knew that Gu Chenfeng had single-handedly swept across southwestern Xilin Commandery, capturing more than half its main cities and slaughtering countless bandits of the Heroes Alliance.
Even the number of Saint Warrior realm cultivators who had died at his hands was staggering, and they included cultivators at the peak Saint Warrior realm.
They also knew that