Call of Duty: United Offensive is an expansion pack for the first-person shooter computer game, Call of Duty. It was developed by Gray Matter Interactive, with contributions from Pi Studios, and published by Activision. It was released for Microsoft Windows on September 14, 2004.
Since October 13, 2006, the game has also been available to buy on Valve's content delivery platform, Steam.
The biggest changes made by United Offensive are in the multiplayer aspect of the game. There are new maps which are much larger than the ones in the original game, new weapons from the single player campaign, an in-game rank system which grants additional bonuses with more points, and vehicles such as tanks and jeeps.
Cpl. Scott Riley is the first playable protagonist of United Offensive in the American campaign. Riley participates throughout the entire Bastogne campaign by defending Bois Jacques, capturing and securing the crossroads and town of Foy, and capturing Neuville.
Sgt. James Doyle is the second playable protagonist in United Offensive, serving as the playable character in the British campaign. Doyle is a Royal Air Force B-17 gunner who is shot down over the Netherlands on the RAF's first daylight mission using the B-17s. The Dutch Resistance, with the help of Major Ingram, an S.A.S. operative, rescue him before he is captured by the Germans. Doyle and Ingram are then sent to Sicily with other S.A.S. operatives to knock out several huge cliff mounted cannon, not unlike those in The Guns of Navarone.
Pvt. Yuri Petrenko is the playable Soviet protagonist in United Offensive. Petrenko participates by helping defend the Soviet trenches, securing Ponyri's streets, destroying German armor in Prok, and assaulting and defending Kharkov until the arrival of Soviet reinforcements.