Black Sheep — was the name of a GLA mission cut 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.
In 2009, to celebrate the sixth anniversary of Generals, Electronic Arts released the scenario for free download. The mission can be downloaded here.