Since this song was recorded during the Cold War, it may also refer to atomic war. "We must leave before the clock strikes twelve" is almost definitely a reference to the Doomsday clock, twelve meaning midnight and complete annihilation on the Doomsday clock.
Since this song was recorded during the Cold War, it may also refer to atomic war. "We must leave before the clock strikes twelve" is almost definitely a reference to the Doomsday clock, twelve meaning midnight and complete annihilation on the Doomsday clock.