Call of Duty: United Offensive is an expansion pack for the popular 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.
The game features single-player missions centered around the three major Allied forces of World War II: the United States as Cpl. Scott Riley, the United Kingdom as Sgt. James Doyle and the Soviet Union as Pvt. Yuri Petrenko. The game also includes historical battles, such as the Battle of the Bulge, Battle of Kursk, and the Invasion of Sicily. A minor deviation from the original game is a bombing mission in which the player mans several M2 Browning machine guns. Several new abilities are added to the game as well, including the ability to actually deploy light machine guns, use flamethrowers, to sprint; which makes the character run faster but at the cost of not being able to fire their weapon, and the ability to "cook" grenades (allowing the fuse to burn somewhat before throwing the grenade).
Sgt. 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 Holland on the RAF's first daylight mission using the B-17s. The Dutch Resistance, with the help of the SAS, rescue him before he is captured by the Germans.
Multiplayer mode features objectives such as planting or defusing explosives, destroying or protecting objectives, capturing or protecting flags, and assisting friendly flag carriers. The ranks are reset each map and are not persistent.