Conditions inviting the North Korean attack were created by the [[United Nations]] which issued a resolution for withdrawal of both Soviet and American troops. Troops began withdrawing September 15, 1948, leaving only about 7500 Americans lightly armed. This left in South Korea 16,000 Koreans and 7500 Americans, both groups lightly armed, against 150,000 fully armed North Korean Communists. General Roberts, head of the U. S. Military Mission said the South Koreans were not permitted to arm adequately.
On January 12, 1950, Secretary of State Dean Acheson gave a speech to the National Press Club excluding South Korea from the defense perimeter.<ref>https://www.trumanlibrary.org/whistlestop/study_collections/korea/large/documents/pdfs/kr-3-13.pdf</ref> Omar Bradley blamed [[Truman ]] and Acheson in his memoir ''A General's Life''.<ref>A General's Life, pg. 528</ref>
=== Outbreak ===