With the 25 June 1950 outbreak of the Korean War, the North Korean People's Army had invaded the Republic of Korea (ROK) with 90,000 well-trained and equipped troops who had easily overrun the smaller and more poorly equipped Republic of Korea Army [REF].
UN units, spread out along the Pusan Perimeter, were having a difficult time repelling these units as they were untrained in combating guerrilla warfare.