The pass of Pingxingguan was a narrow defile worn through the loess, with no exit for several kilometres except the road itself.
Lin's division were able to ambush two columns of mainly transportation and supply units and virtually annihilate the trapped Japanese forces.

On September 25, the 21st brigade of the Japanese 5th Division stationed at Lingqiu received a request from the 21st Regiment that they 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 meters; 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 September 28.

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, 2000 shells as well as some clothing and food.
The pass of Pingxingguan was a narrow defile worn through the loess, with no exit for several kilometres except the road itself. Lin's division were able to ambush two columns of mainly transportation and supply units and virtually annihilate the trapped Japanese forces.
On September 25, the 21st brigade of the Japanese 5th Division stationed at Lingqiu received a request from the 21st Regiment that they 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 meters; 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 September 28.
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, 2000 shells as well as some clothing and food.
Battle of Pingxingguan