The battle of Zhongtiaoshan started on the afternoon of May 7th, 194 1. When he hung his head on the Western Hill, he was suddenly attacked by the 227th Wing of the 37th Division Right Wing at the junction of the 80th Army and the 3rd Army, 30km east of Yuncheng in the west wing of the battlefield. This is a feint, mainly aimed at the position of the 27th Division. 19, the left wing 226th United once again feinted the position of the 20th Regiment, 7th Division, Xiajiao Village, Zhang Jiayu. Then the main attack at the foot of Liupo-Kannonji. At 22 o'clock in the evening, the Japanese army raided the 20 th regiment of Caijia Yaotou. After the fall of the regimental headquarters, the whole position was leaderless. The Japanese army showed excellent military quality, and the breakthrough at night was very firm. After breaking through the position of the 7 th Division, the striker advanced all the way to the saddle of the mountain watershed, and it was only in the early morning of the 8 th 1. Then the left and middle propulsion teams of the 37th Division climbed over the hill and began to go deeper. Interpolation at night makes the national army very passive. Sijiao Town, where the headquarters of the 7th Division is located, was attacked that night, and even the 3rd Army Headquarters stationed in Tang Hui Village issued an alarm. Upon hearing the news, Tang Huaiyuan, commander of the 3rd Army, on the one hand ordered the 34th Regiment of the Reserve 12 Division to reinforce the position of the 20th Regiment, and on the other hand ordered the 36th Regiment to panic in the Japanese army that had invaded Sijiao Town. The attack on Sijiao Town and Tang Hui Village is the left-wing forward team with the first brigade of the 225th United Front as the backbone, and the troops of the 36th Division. By dawn, as the west wing of Zhongtiaoshan, the front of the 80 th Army and the 3 rd Army was in chaos. In Jiangxian Middle Road and Henglingguan, the Japanese troops who broke into the area were the 9th Brigade and the 4th1Division, and their fighting methods were the same as those in the West Wing. Starting from 16, aim at the junction of 17 Army and 43 Army, attack Henglingguan position along the west side of Gao Heng Avenue, and push the brigade as the backbone to penetrate deeply. Face-to-face 43 rd Army is hard to resist. At dawn, several advancing teams have penetrated into the rear. Face-to-face fighting of the 9th Army in the East Wing started on 7th 13, and the 2nd135th Division attacked Meng County in Jiyuan in three groups. The army met with little resistance. By noon on the 8 th, the two places had been abandoned and moved to the established position at Fengmenkou. In Chengyang in the northeast, the 33rd Division of the Japanese Army pretended to attack the position of the 98th Army in order to attract the attention of the national army. There was no fierce fighting. The battle of Zhongtiaoshan, which started on the afternoon of the 7th, was extremely unlucky for the national army at noon the next day. The Japanese army has already extended four iron tongs to double surround the Fifth Army.