At 4 a.m. on June 25, 1950, North Korean troops poured across the 38th parallel into South Korea. The Soviet Union had supplied North Korea with large quantities of military equipment, including tanks, artillery, trucks, guns, ammunition, uniforms, rations and all the supporting elements necessary to field a modern military force. The North Korean air force was equipped with 62 Ilyushin-10 ground-attack aircraft, 70 Yakovlev Yak-3 and Yak-7B fighters, 22 Yak-16 transports and 8 Polikarpov Po-2 trainers. The force completely outclassed South Korea’s air force.
On June 27, 1950, the United Nations authorized the use of military force to stop North Korea’s attack. Eight hours after the authorization, the United States Far East Air Force (FEAF), the air element of the Far East Command (FEC), began flying the first combat air sorties over South Korea. President Harry S. Truman directed General Douglas MacArthur to supply South Korea’s military forces from U.S. quartermaster depots in Japan and to commit available U.S. forces to attack North Korean forces crossing the 38th parallel. American ground troops would be supported by land- and sea-based airstrikes. As the ground situation worsened for the retreating South Korean forces, Truman authorized MacArthur to expand airstrikes north of the 38th parallel against North Korean supply depots, railyards and supporting strategic targets.