Firefight was one of the best parts about Halo 3: ODST even if it wasn't fully featured with things like online matchmaking. Bungie is bringing it back for Halo: Reach though and adding many new improvements.
Halo 3: ODST introduced "Firefight" to the Halo series and much like "Horde" mode in Gear of War 2 it pitted four players against wave after wave of enemies. Teamwork and strategy were required to survive to the very end and the new game mode ended up being a hit with Halo gamers despite missing a few components like online matchmaking. Now Bungie has introduced an all new and improved Firefight for the Xbox 360 exclusive Halo: Reach at E3.