The following is based on Generals cut content and has not been confirmed by canon sources.
Black Sheep was the name of a GLA mission cut from C&C Generals before its release. It was cut due to the controversial nature of the mission; the player is tasked with eradicating civilians in a town sympathetic to Chinese forces.
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 the C&C Generals, Electronic Arts released the scenario for free download. The mission can be downloaded here.
During the ending of the GLA campaign against the USA and China, the second scene shows the cut part of this mission, which a Toxin Tractor arrives at a village square before coming to a halt and starts spraying toxins at the people, eroding the civilian population to death.
Similar to another GLA mission, Almaty Supply Raid, this mission also displays HP for civilians.
Chinese forces will try to disrupt your movement from the base by deploying Cluster Mines. There is a glitch that, if the player captured Chinese Command Center to prevent this, the plane (in green livery, the GLA's) will still drop the Cluster Mines to your base, but the Mines will no longer harm the GLA.
Anthrax Bomb in this mission may be obtained by destroying the Pharmaceutical Factory. If the player did not notice this after some time, the "informants" will reveal its location to the player.