The destruction of the KPA at Pusan made communist continuation of the war impossible with North Korean troops alone. The massive equipment and manpower losses rivaled those of the ROK in the first stages of the war. The North Koreans totally collapsed as a fighting force, and the remainder of their routed military retreated into North Korea offering very weak resistance against the UN force, which was now on the offensive with overwhelming superiority by land, air and sea. Many of the outmaneuvered KPA units simply surrendered, having been reduced from units of thousands to just a few hundred men.