5 Months Ago, Examiner.com says (in Halo 3: ODST Priced as a Full Game) Halo 3 ODST "Firefight" mode, a new cooperative multiplayer mode where up to four players can assume the role of an ODST squad and fight together to take on increasingly challenging waves of enemies. Sounds very similar to Gears of War 2's Horde Mode. ...

6 Months Ago, Shacknews says (in Microsoft Defends Halo 3: ODST's $60 Price Tag) Gears of War 2's Horde mode. Meanwhile, the game's single-player component has players exploring an open-world rendition of New Mombasa and reliving the experiences of missing comrades. Along with the above, Halo 3: ODST will also pack multiplayer ...

And Neoseeker says (in Halo 3: ODST in-depth preview with Bungie) On top of the usual competitive modes, this game introduces Firefight, a cooperative multiplayer mode similar to but more expansive than Horde Mode in Gears of War 2. In Firefight, players team up with three allies and face off against increasingly ...

And Kotaku.com says (in Halo 3: ODST Firefight Preview: OUHave12) I loved Horde mode in Gears of War 2 and I love Firefight in Halo: ODST, both are fantastic multiplayer coop modes that force gamers to work together to survive. Adding skulls, achievements and leaderboards make it all the more fun.
E3 2009: Halo 3 ODST Firefight mode hands on MLive.com

And Examiner.com says (in 'Halo 3: ODST' four player fire fight mode) It's like 'Gears of War 2's Hoard mode, but with vehicles... and plasma grenades. Fire Fight mode is played in sets. Each set is made up of five waves of enemies increasing in difficulty as you go. Between waves the players are re-supplied with ammo ...

And NintendoDS Advanced says (in E3 2009: Halo 3 ODST Hands-On) After walking me through the campaign demo, Bungie finally let me get my grubby mitts on the controller to try out their new FireFight multiplayer mode. Firefight is a cooperative mode in the vein of Gears of War 2's 'Horde Mode' that puts four players ...
E3 2009: Microsoft Audioholics