Begin the battle by going to the two nearby bases and capturing them. This will cause a battering ram spawn for your forces and head to the front gate of the castle. However, a pendulum axe will appear and end up destroying the battering ram. Since the front is out of the question, it's time to attack from the sides. Depending on who you're playing as, you'll either go to the east or west (this guide will go to the east).
Once you make it to the designated spot, defeat the officer there to open the gates. Inside, you'll find some statues that shoot fire, so you need to get past them and take downthe officer in charge of the statues, who happens to be Yue Jin. Continue farther into the castle until you get to a room with some large fans.
The officer in charge of the fans is Xu Zhu, who happens to be located behind the fans themselves. With that out of the way, start making your way towards the throne room, where Cao Pi is located. Along the way, you'll encounter Li Dian, as well as Cao Ren guarding the gate leading to it. Once inside, take out Zhenji and then Cao Pi to finish the battle.