Red Square

Red Square, also known as Fallen Fighter's Square, was an area of Stalingrad that was featured prominently in Call of Duty and Call of Duty: World at War. It is featured in the second mission of the Russian campaign in the first Call of Duty, and in the first mission of the Russian campaign in World at War. In both games, Red Square was the scene of a huge massacre of Soviet troops by the defending Germans, and the player character is portrayed as having survived through the help of another, more experienced, soldier. The two games depict the 13th Guards Rifle Division and the 62nd Rifle Division making two separate attacks on September 17 and 18, with the events in World at War happening before the first Call of Duty. Whether or not the success of Alexei Ivanovich Voronin and the 13th Rifle Division was caused by the death of General Amsel is unknown. Red Square is also in Call of Duty 2 at the very last Russian level, Comrade Sniper.

Trivia
The setting for both games seems to take influence from Enemy at the Gates and it's famous opening scene, which depicts waves of Soviet troops being thrown against a wall of German troops, with horrifying, yet predictable results. The scene also depicts the titular character - Vasili Zaitsev - surviving only by feigning death in the fountain in the same vein in which Dimitri Petrenko survives. The version of Red Square depicted in Call of Duty does not seem to portray the actual Square, while the one in World at War is most similar to the actual Square.