Dynasty Warriors 3: 4th Weapon Guide - Lu Xun

This is a guide in order to obtain the 4th weapon for Lu Xun, in Dynasty Warriors 3.
Weapon Name
Falcon
Base Attack: +42
Element: Steel (C4)
Speed: +22
Musou Max: +75
Defence: +43
Reach: +29
Requirements:
Stage: The Battle at Yi Ling (Original Mode) - Wu Forces
Either keep Gan Ning or Lu Meng alive, while passing through the Stone Sentinel Formation, and defeating Zhuge Liang. Weapon Box appears in the north east corner of the Stone Sentinel Formation.
Other notes:
This is the first challenging weapon I've had to tackle, and yet, it's manageable once you know what you are doing. Keeping Lu Meng and Gan Ning alive can be tricky but it helps to know which of the generals to take on first. I like to go for Wei Yan first as he starts directly in front of you, and it helps keep Lu Meng alive easier. Gan Ning has enough endurance to survive until the fire attack succeeds, at which point you should free him up by beating Ma Chao. Other generals can be taken out at your discretion, but the less Lu Meng has to deal with the better for keeping him alive.
As for the fire attack, it is not necessary, but it certainly makes the battle easier, so I would recommend getting that under way as soon as you can. Defeat Zhang Bao and any troops that get in the way, and ensure Zhu Ran reaches the left side of the central fort. Sometimes Huang Zhong can stop Zhu Ran as well, as was seen in the video.
Once you are sure either or both of your ally generals are safe enough, make your way through the Stone Sentinel Formation. Hug the left wall to make it easy to go through. This stage is very liberal with its crossbows and archers, so bear that in mind as you make your way through.