MacArthur's War Mar 51 - UN Response - The Bomb (x8)

The Chinese secure their beachhead on Formosa and the USSR mobilizes units in Siberia. The US begins moving US reinforcements from CONUS to Korea or Formosa. The UN shortens its lines in Korea shifting to the defensive.
But then 8 atomic bombs are dropped behind Chinese lines effectively severing all rail lines and supplies to their units in Korea.