In the new Generals Challenge mode, a player's subfaction is pitted against the other eight on their home territory. Some subfactions may not be able to build every unit available to its umbrella faction but may have access to specialized technology that no other group has. Each has its own unique leader and its own playing style. Zero Hour introduces nine subfactions, units under one of the three powers, including the US air force and the Chinese infantry. Read More China, or the GLA terrorist group. The GENERALS series puts players in command of one of three world powers: the US. COMMAND & CONQUER GENERALS, a subset of the popular COMMAND & CONQUER real time strategy games now under the banner of EA Games, refined the series even more, and now the Zero Hour Expansion Pack refines GENERALS, perfecting the series' best while adding new elements.