An expansion to the original Call of Duty, United Offensive brings players back to world war II on 3 different fronts. As Corporal Scott Riley fights the Bastogne battle in Germany, Sergeant James Doyle braves the freezing cold to the town to Foy. He gets shot in the Netherlands but manages to escape with the help of the Dutch Resistance before aiding the British war effort in Sicily. Meanwhile, in Kharkov, Private Yuri Petrenko is stationed in Soviet trenches, ready to protect his motherland.

United Offensive is the lengthy expansion pack to Call of Duty, taking players to new fronts and new battles in the conflict that changed the face of the world.