Originally Posted by
Fareastdriver
The Allied forces didn't notice it in October 1950.
Ummmm, no. The Chinese build up of forces was well observed and well known. The powers that be just assumed the Chinese would never actually attack because it was assumed such an attack was certain to trigger a nuclear response from the US. Nine bombs complete with nuclear cores and nuclear capable delivery B-29 bombers were forward deployed to Okinawa. But the Chinese figured the US was bluffing and attacked. The Chinese were right. No nukes ever made it into the Korean theater.
It was probably just as well, because over a 160 kilotons of conventional bombs had been dropped on North Korea. There were very few significant targets left.