ABLE ARCHER is an operation in Wargame: European Escalation, based on the Able Archer 83 military exercise.
Able Archer 83 was a five-day NATO command post exercise starting on November 7, 1983. The exercises simulated a conflict escalation, resulting in a nuclear attack.
Because of past conflicts with NATO, the Warsaw Pact mistaken the Able Archer exercise as an actual preparation for the invasion of the Soviet Union. The Warsaw Pact invades West Germany, initiating the Third World War.