S4: How did the enemy exploit sustainment weaknesses to contribute to the US withdrawal to the Pusan Perimeter?

Basically, the NKPA on June 25, 1950 initiate the attack and start heading south using spies also attacking without any warning getting the ROK off guard or with theirs hands down. The ROK leadership were spending their time having leisure time on post and no focus, preprared or expecting any kind of attack.

Then the U.S started evacuated the zone leaving a lot of assets behind like food, fuel etc. The americans were going down dying but still couldn’t figure out how to neutralize the enemy and how to implement a logistic plan, everything were more focus on evacuated personnel and destroy this big enemy forces.

The NKPA exploited sustainment weaknesses by getting the ROK and the Americans off guard with theirs hands down destroying our forces with a BIG forces( tanks) at the beginning of this attack.