Dynasty Warriors 5, Sun Quan 4th Weapon

Do this in Sun Quans musou mode, as its only his second stage or something, which makes it much easier. All you really need to do is to make sure the fire attack succeeds. Defend Pang Tong and tear down both bridges, make sure Huang Gai makes it safely to his strategy point, and defeat Zhang Liao so Zhuge Liang can commence and finish his prayer.