Li Yu trusted in Crown Prince Chong Ming whom she had known for many years. That was the reason why the betrayal and slaughter raging in the Capital of Yan Kingdom tonight would happen. Xian Zhilang trusted Li Yu, but he was an able general of the empire who was known for his resourcefulness; besides acting in concert with Yan Kingdom's move according to Li Yu's demand out of his confidence in Li Yu, he did not forget to make his own arrangements.
For the sake of safety, he arranged a way out for thousands of Tang Empire black-armored cavalries to sneak into Chengjing City. The way out lied in the relatively least eye-catching Eastern City Gate.
The military orders were spread from restaurants to everywhere in Chengjing City via fireworks and the loyal cavalries. The cavalries of Tang Empire fought their enemies bravely and made their killing towards Eastern City Gate desperately, gradually gathering.