The Battle of Taiyuan (; ) was a major battle fought in 1937 between China and Japan named for Taiyuan (the capital of Shanxi province), which lay in the 2nd Military Region. The battle concluded in a victory for Japan over the National Revolutionary Army (NRA), including part of Suiyuan, most of Shanxi and the NRA arsenal at Taiyuan, and effectively ended large-scale organized resistance in the North China area.
Japanese forces included the Japanese Northern China Area Army under Hisaichi Terauchi, elements of the Kwantung Army, and elements of the Inner Mongolian Army led by Demchugdongrub. Chinese forces were commanded by Yan Xishan (warlord of Shanxi), Wei Lihuang (14th Army Group), and Fu Zuoyi (7th Army Group), as well as Zhu De who led the Eighth Route Army of the Chinese Communist Party (under the Second United Front alliance).
Occupation of the territories gave the Japanese access to coal from Datong in northern Shanxi, but also exposed them to attacks by the guerrilla forces of the Nationalist army including the Eighth Route Army, tying down many Japanese troops which could have been diverted to other campaigns.
Background
After the Marco Polo Bridge incident in July 1937 the Japanese invaded North China. By the end of that month the Japanese North China Area Army (jap 北支那方面軍, Kita Shina hōmen gun) under Lieutenant General Kiyoshi Katsuki were at the outskirts of Beiping. In August and September 1937, following the capture of Beiping and the commencement of the offensive westwards through Nan Pass to Shanxi, the North China Area Army advanced southwards along the primary rail lines. However, the advance was necessitated to be suspended in order to allocate resources to the Shanghai front, which required three divisions, and the Manchuria front, for which one division was required. The group made a strategic halt at the Yellow River near Jinan, which is located on the border of Shandong province. In this particular instance, it is conceivable that a cessation of hostilities would have occurred in anticipation of Han Fuju, the governor of Shandong, potentially aligning with the Japanese.
Instead, while the Japanese were waiting, Governor Han obeyed Chiang Kai-shek's orders to destroy Japanese property. In Qingdao, the local authorities suddenly purchased 10,000 gallons of kerosene, which they used to carry out the destruction on 29 and 30 December. Due to Japan's significant investments in Shandong, it was crucial that the province be captured swiftly, prompting the North China Area Army to resume its advance. This time, Han chose not to fight, for which Chiang had him executed, and the Japanese occupation of Qingdao was unopposed. Operations in China now came to a halt. The 1937 campaigns had consumed vast quantities of men and munitions, and the Rape of Nanking alone had caused a breakdown in discipline serious enough to undermine the military effectiveness of the mainland armies. Time was needed to consolidate, replenish and repair the war machine before it could advance again.
Battle
Despite the military leadership's urging, Seishiro did not intend to advance immediately. At this time, the Shanxi Army (2nd Area Army) was gathering in Yanxishan along the Nei Jangcheng Line and strengthening its defences. Seishiro, was determined to attack these enemy forces to prevent their advance. On 19 September, Lieutenant General Itagaki expressed his opinion in a personal letter to three officers, Shun Tada (Deputy Chief of the General Staff), Kanji Ishihara (Chief of Operations, General Staff Headquarters) and Juichi Terauchi (Commander of the North China Area Army), that in North China, the line of Suiyuan, Taiyuan, Shijiazhuang, Jinan and Qingdao should generally be occupied and the resources encompassed there should be acquired, and that a new North China Government should be formed. The proposal for the establishment of a new North China Government was conveyed in the form of a personal letter to Tada Shun (Deputy Chief of the General Staff), Ishihara Kanji (Chief of Operations of the General Staff) and Terauchi Juichi (Commander of the North China Area Forces). At the General Staff Headquarters, Akira Muto, Chief of the Operations Section, tried to persuade Ishihara and Tada, who were non-expansionists to commence with the operation.
Pingtung Kan
On 21 September, Lieutenant General Itagaki, commander of the 5th Division, issued an order to the 21st Infantry Brigade (Miura Detachment) instructing them to pursue the enemy from Lingqiu to Dayingzhen. On 22 September, the Miura Detachment (comprising three infantry battalions) met with heavy resistance from Chinese forces in the vicinity of the Pingxing Pass (a mountain pass situated near the present-day border between Lingqiu County's Baigaidai Township and Fanshi County's Hengjian Township) as they gradually advanced towards Dayingzhen. General Yan Xishan, commander of the Second War Zone, had ordered the deployment of the 6th Group Army (under the command of Yang Aiyuan), the 7th Group Army (under the command of Fu Zuoyi), and other units around 60,000 to 70,000 men along the Great Wall line connecting Pingxing Pass, Yanmen Pass, and Shenchi against the Japanese advance.
As a consequence of the Nationalist-Communist Cooperation Agreement, the Chinese Communist Party dispatched the 18th Group Army (Eighth Route Army) to Shanxi Province in mid-September to support the operations of the Second War Zone. The 115th Division, under the command of Lin Biao, advanced east of Pingxing Pass, undertaking a diversionary offensive against the Japanese rear. On 25 September, Chinese reinforcements under the command of Fu Zuoyi were deployed in a counterattack on the front lines at Pingxing Pass, resulting in the encirclement of the Miura Detachment. At the same time, the 115th Division, which had initiated its operation, launched an ambush on the supply units of the 5th Division between Xiaohan Village and Guankou Village. They targeted a logistics motorized company that was returning to Lingqiu from the front line and a large baggage train of the 21st Infantry Regiment that was advancing to the front line. As a result, their forces were almost entirely annihilated at around the same time. A total of 150-240 Japanese casualties were recorded.
The loss of supply units has led to a shortage of ammunition within the Miura Detachment. When Itagaki learned of the critical situation of the Miura Detachment on 25 September, he ordered the 42nd Infantry Regiment to advance rapidly towards Pingxing Pass. Meanwhile, the leading elements of the 21st Infantry Regiment attempted to outflank Pingxing Pass from the north, but joining the main forces of the brigade on 28 September. Concurrently, the Kwantung Army directed the Tokugawa Detachment to proceed towards Pingxing Pass on 22 September to provide support to the 5th Division. Thanks to these reinforcements, the 21st Infantry Brigade (Miura Detachment) was able to launch a coordinated attack on 29 September, with support from the Tokugawa Detachment. However, the attack was unsuccessful.
At the same time, the Kwantung Army received reports that the 5th Division had breached Pingxing Pass, captured Dayingzhen, and was advancing westward toward Fanshi. This report however turned out to be false. Based on this misinformation, the 15th Mixed Brigade and the 2nd Mixed Brigade were deployed to Fanshi with the objective of cutting off the Chinese retreat. However, they encountered a strongly fortified position at Yueyuekou along the Great Wall line. The 15th Mixed Brigade commenced assaults on 27 September, breached the opposing forces' defences on 29 September, and swiftly advanced to occupy Fanshi. Uporn learning that their rear were cut off the Chinese forces there began a general retreat on 30 September. Despite the anticipated westward withdrawal towards Fanshi, the majority of the Chinese troops retreated southward towards Wutai Mountain. As a consequence of this strategic manoeuvre, the understrength mixed brigades failed to inflict significant disruption as they pursued the enemy. On the same day, the Miura Brigade rallied at Dayingzhen for rest. During the operation, the 5th Division suffered 1,070 casualties. Combined with the losses of the mixed brigades and attached units, the Imperial Japanese Army and Kwantung Army suffered a total of 1,506 casualties in the operation.