Once the battle begins, fight the enemies around you until some phantom soldiers appear. You can't hurt these enemies, so you need to go to one of the designated spots and find the one responsible for making them appear, which will be nothing by a Unit Commander. As you continue exploring the forest, an ambush of archers will appear and will continue on until you finally reach the garrison and Xu Gong appears.
Defeating Xu Gong will trigger a short scene and after it's over, Cao Cao's forces will arrive. You'll need to escape the battle with Sun Ce, so start heading east and taking the path over there. You'll run into some officers such as Yue Jin and Li Dian. Defeat them as they come, with Li Dian being the second officer, which will trigger Xiahou Dun to start advancing.
Once you make it into the last garrison, there will be a lot of officers in the way, including Xiahou Dun, Cao Ren and eventually Guo Jia, who is the one blocking the escape point. Utilize musou attacks and your Rage, if you have it full, to cut down all of the enemies in your way. When Guo Jia is gone, the gates to the escape point will open, so head to it to finish the battle.
|You need to defeat both Xiahou Dun and Gan Ji in order to unlock 3-X. Defeat Gan Ji. As soon as you escape from the forest, Xiahou Dun will appear in the northwest corner. Continue the battle like normal after taking out Xiahou Dun, until you see Guo Jia appear. Around the time he does, Gan Ji will appear in the very same base as Xiahou Dun did. Go back, defeat him and finish the stage.|