1935 was awarded the rank of lieutenant general in April.
During the War of Resistance against Japanese Aggression period, he led his troops to participate in the Battle of Shanghai and Shanghai. 1April, 938, defeated by the Japanese army in Madang District of Jiangfang, and retired from office by Chiang Kai-shek.
1938 during the Wuhan campaign, the garrison near Madang fortress was Li Yunheng's 16 army. In June, the Japanese army failed to attack by water and changed to attack by land. However, Li Yunheng managed to run a two-week "Anti-Japanese Military and Political University". On June 24th, Li Yiheng also held a grand graduation ceremony, inviting officers at all levels and local gentry of the 16 Army to attend. As a result, the war zone of 16 Army lacked the management of the chief officer, and the Japanese army must have obtained this information in advance. So in the early morning of June 24, the 16 army successfully landed in the east, and then successfully captured Xiangshan and Xiangkou, which were neither prepared nor commanded by the chief. Fortunately, the 2nd Brigade of the Marine Corps, which defended the core position of Changshan in Madang Fortress, did not send anyone to attend the graduation ceremony. The 2nd Brigade, under the command of Bao Changyi, the battalion leader, resisted tenaciously and repelled three large-scale group attacks by the Potian detachment. Bao Changyi played in the dark here, and Li Yiheng had a grand graduation ceremony there. After he finished, he ate and drank a mess. Seeing that 16 troops can't count on it for the time being, Bao Changyi quickly sent a message to his old boss Xie Zhegang in Wuhan. Xie Zhegang was surprised when he saw the telegram. He immediately reported to Chiang Kai-shek and urgently requested the air force to dispatch. Chiang Kai-shek was even more surprised to see the telegram sent by Xie Zhegang. He immediately called Bai Chongxi, who was inspecting Tianjia Town, and asked him to find a way. Bai Chongxi reacted quickly, looked at the map, immediately called Penzer 167 Division, and asked the teacher Xue to immediately lead the troops to reinforce Changshan. Li Yiheng and Bao Changyi didn't react until they called, so it happened that they also called 167. Xue suddenly received two different orders. Bai Chongxi ordered him to rush over from the highway to help, while Li Yihang told him to take the path. In the face of Xue's two different orders, he thought for a long time. Finally, out of contempt for Bai, the old deputy general manager, he chose to listen to Li Yiheng. After two days of persistence, Bao Changyi's 2 brigades here suffered more than half of casualties and the shells were exhausted. In order to avoid the annihilation of the whole army, the second brigade had to evacuate its position. After the Japanese army occupied Changshan position, the 16 army once fought back, but it soon failed, and even the Madang battery was lost. Chiang Kai-shek saw that he wanted to keep a horse for a month, but he lost it without keeping it for a week. He called Chen Cheng, commander of the Ninth Theater, overnight and scolded him. Chen Cheng immediately ordered the 16 Army and the 49th Army to counterattack Madang. The Japanese army relied on Madang's solid first-class national defense readiness fortifications and stubbornly resisted, which repeatedly frustrated the national army's attack and caused heavy casualties. Chen Cheng had to stop the attack and retreat to Penzer. Chiang Kai-shek was very dissatisfied with this result, and Li Yiheng was dismissed for investigation.