Your first goal in this battle is to capture Mianzhu Garrison and Fu Castle, which are the two bases on the southern side of the map. There will be a few officers in the way before Mianzhu, so take them out and then the officer inside to capture it. Do the same thing with Fu Castle to capture it, although make sure you defeat Liu Jun, who will come slightly from the north to go after Mianzhu.
Note that Pang Tong will likely be injured by an ambush, if you're not playing as him. Either way, some officers will make their way from the western path, so stick around in the center to take care of them. After that, your next target is to capture Luo Castle, so head there and take out the officers inside to make it yours.
Whenever Liu Bei gets to the central garrison, an ambush will be launched and the gates closed. If you are outside of the garrison, you will need to circle around and drop in from the north. If you go around the right side, defeat the other ambush troops to lower the drawbridge to make Shu reinforcements come. Once they do arrive, they will bring catapults to knock open the main gate to Chengdu.
When you arrive inside of Chengdu, both Ma Chao and Ma Dai will appear. Do battle with them and upon their defeat, they will join your army. This will cause panic inside of Chengdu and the gates will open. Defeat all of the officers that get in your way, then head to Liu Zhang to fight. Once Liu Zhang is done for, the battle will be over.
|Both Hypothetical situations in this battle involve Pang Tong, and it makes it a lot easier to use him. When you are asked to take the easternmost path, don't as when you get to the one area, you will be ambushed and you will fail, making it so you have to start again. Instead, take the northern of the two eastern paths and inside the first garrison, you'll find a ladder on the east side, leading up to a ledge. Climb it and you'll force Zhang Ran to spawn. Defeat him and the ambush will be defeated, making it so Pang Tong will make it through the entire battle alive.|