Black Sheep was the name of a GLA mission cut or lost from Command & Conquer: Generals before its release. In this mission, the player is tasked with eradicating civilians in a town sympathetic to Chinese forces. This mission was likely meant to take place between Pillage the Village and Astana City.
The player is given a quota of civilians (typically 300) to kill and is given chemical weapons (namely Toxin Tractors and Anthrax Bombs) to complete the mission. The player also battles Chinese troops, as the People's Liberation Army has a major presence in the town.
To play this Mission, click Solo Play and click on Custom Mission.
There you should see map named Workshop - Black Sheep 1, click on it and choose the difficulty, then hit play.
Have fun with the lost GLA mission that was suppose to be the 3rd mission on GLA campaign.
