urgently needed supplies due to falling temperature. The supply troops of the 21st Regiment set out with 70 horse-drawn vehicles with 50 horses, filled with clothes, food, ammunition and proceeded westwards towards Pingxingguan. Around 10:00, the supply column passed into a defile with the two sides rising up more than 10 metres; they were heading towards Caijiayu about 3 km away. At the same time, a motorized column of Japanese supply troops in about 80 trucks left Guangou and headed east. Both of these non-combat formations entered into the ambush set by the 115th division after 10 a.m. on the 25th and were largely wiped out. A relief force consisting of the 3rd Battalion of the 21st Regiment was rebuffed by Chinese troops and suffered almost 100 casualties. Lin Biao's troops eventually withdrew from the battlefield, allowing the Japanese to finally reach the site of the ambush on 28 September. The Nationalist Air Force of China provided some close-air support for the Chinese ground forces in course of the battles at Pingxingguan. Japanese casualties in the battle have been estimated at 400 to 500 and the Chinese at about 400. The Chinese forces destroyed about 70 trucks and an equal number of horse-drawn carts and captured 100 rifles, 10 light machine guns, 1 gun and 2,000 shells as well as some clothing and food. Evaluation The Kuomintang's official history of the Second Sino-Japanese War deals with it in a sentence, without any credit to the Communists. On the other hand, the Communists' accounts describe Pingxingguan as a typical example of Red guerrilla tactics, inspired by Mao Zedong's conceptualization of people's war. Japanese losses were greatly exaggerated for propaganda purposes. However, like the victory at the Battle of Taierzhuang, Pingxingguan was explained by Japan as Japanese officers succumbing to what they came to call "victory disease." After a series of easy victories against their opponents, they failed to take elementary precautions. Japanese commanders seldom repeated the operational blunders that had led to Pingxingguan. Nonetheless, the battle gave the Chinese a major boost in morale and credence to the Communists in the eyes of the people. The battle was constantly cited by CPC leaders as an example of their commitment to battling the Japanese occupation, even though Mao had opposed the battle, according to an account written by Lin Biao in Russia (where he was being treated for bullet wounds) and Lin