Prepare to unleash the absolute latest in modern weapons technology against the world’s most powerful Generals in Command & Conquer™: Generals Zero Hour*. In the next era of military strategy and might, you’ll need to command a more technologically advanced arsenal to defeat new, more powerful enemies. The first expansion pack for the critically acclaimed Command & Conquer™: Generals challenges players to square off against the world’s most elite commanders for battlefield domination. Even the most experienced C&C Generals veteran must learn new strategies and tactics to take full advantage of—and learn to defend against—the next generation of the world’s most lethal weapons. With new units, structures, and upgrades, as well as the all-new Generals Challenge Mode, Zero Hour delivers all the firepower you’ll need in your quest to become the ultimate modern warfare General.

• Next-Generation Armies for the Next Generation of War - Unload on your enemies with an all-new, hi-tech arsenal featuring 30 new units and 20 new upgrades from the Chinese ECM Tank to the United States Spectre Gunship.
• The Ultimate Challenge - Enlist in the all-new Generals Challenge mode where you match your strategies and your next-generation arsenal—against 9 enemy AI Generals with unique personalities, tactics, and taunts.
• New Missions, Tomorrow’s Headlines - 15 new missions rattle veteran Generals as they set out to destroy the U.S. fleet in the Mediterranean, root out a splinter cell in Cairo, and send in special operatives to capture weapons of mass destruction.
• Combat the Elements - All-new weather effects further immerse you in a more realistic combat environment.
• Take the Battle Online - Prepare for multiplayer mayhem with 25 new multiplayer maps!

from EA.com