Defend the Siege (Horde)

It's very touchy how this quest works
from what i've seen, here is the requirement
that you attack, and aid in killing a player of the opposite faction, who is attacking a vehicle, that destroys a wall/structure

yeah, convoluded

the best way i've seen for this to be completed is in the last minutes of wintergrasp, when the keep door is being attacked. If there are three vehicles that all aide in destroying a single wall, and you defend all three, you get full credit for the quest.

i hope this helps you all out.
Camane, Dunemaul

Alright, here's how to find him. If you go at any random time to your landing site or the keep when a battle isn't scheduled any time soon, he'll most likely be there. However, both at the start and end of a battle, I assume as part of the process that resets Wintergrasp, EVERY quest NPC despawns. A few minutes after the start of the battle or the end of it, they'll spawn where they're supposed to be, either at the landing camp or in the fortress.

Edit - Example Process:

Alliance controls WG, 30 minutes until battle
He is spawned at the Flight Point
or
Horde controls WG, 30 minutes until battle
He is spawned in the Fortress

Battle Begins
He is despawned
About 5 minutes into battle
He respawns at wherever he was before the battle started

Battle Ends
He is again despawned
About 5 minutes after battle
He respawns in Fortress if Horde won, at the base camp if Alliance won

It looks like you if have this quest, you cannot also have Stop the Siege at the same time.

So make sure you have the proper one depending on if your side is attacking or defending. You need to drop this if your side is on defense to get Stop the Siege.