Rogue Spear: Black Thorn was developed by Red Storm Entertainment, published by Ubisoft, and released as a stand-alone add-on for Tom Clancy's Rainbow Six: Rogue Spear on December 15, 2001. Black Thorn featured nine new single-player maps. Mission eight was edited in the US release (modified from an airport into a coach terminal) and a mission featuring an A380 aircraft was removed in all releases after the September 11, 2001 attacks. This delayed the release. Six new multiplayer maps, 10 new weapons, and a new multiplayer variation on the "Lone Wolf" game type in which one player takes on everyone else; the winner of the round then becomes the new "Lone Wolf". The plot features a mentally disturbed ex-SAS operative challenging Team Rainbow with reenactments of real-life terrorist attacks, such as the Entebbe raid and the Japanese embassy hostage crisis.
Source: Wikipedia, "Rogue Spear: Black Thorn", available under the CC-BY-SA License.