"The turning point came September 15  when General MacArthur made an amphibious end-run and landed forces at Inchon, 150 miles behind the enemy's rear line. After that it was all U.N. In 36 days Seoul was retaken, Pyongyang fell and enemy resistance crumbled... The battle to curb aggressors is about over."
"Last week... Syngman Rhee, President of the Republic of Korea... appointed governors for the five North Korean provinces."
Between October 1 and November 2 (1950), it seemed as if the the U.N. Armies were beginning to believe that history would remember the Korean War as a five month "police action", one in which the U.S. had only suffered a mere 5,000 dead with 18,129 wounded - and that very well might have been the case - but on November 3, the Chinese Army attacked the U.N. Armies in force.
You can read about the Chinese invasion here...
The possibility of W.W. III was very much on the minds of Americans during the summer of 1950; by September an article appeared in print forecasting how such a contest might begin - click here to read it.