Cho'gall's Twilight Proveditors swear a blood oath that they will get their supplies through to the front, pledging a pound of their own considerable flesh for every pound of supplies they fail to deliver. They would rather die than fail.
See to it that they do both.
Rewards
You will also receive: 7 80
Progress
Every supply caravan we stop in its tracks will lead to more victories on the front.
Completion
Well done! The chaos we sow back here will be felt up and down the chain of command.
The Twilight Proveditors spawn on the road between the Twilight Command Camp and the Shrine of Goldrinn. They are accompanied by a Twilight Slavedriver and 3 slaves carrying the supplies needed for In the Rear With the Gear. Once you've slain the Twilight Proveditor, the slaves drop their cargo. Each slave yields 3 supplies. Imho the spawn times are too long, and there are too few spawn points. While I was doing the quest, other players would swoop in at the last moment, and steal the supplies. The best spot to farm them I found is 36.27, 22.83 (next to a lamp, close to the Twilight Command Camp) (there is another spawn point at 32.5, 25.8).