Suiyuan campaign
In September 1931, the Mukden Incident triggered a chain of events that reshaped East Asia. The Japanese Kwantung Army occupied three northeastern provinces of China and defeated Zhang Xueliang, known as the Young Marshal. This military action paved the way for establishing Manchukuo in 1932 under Puyi, the last Qing emperor. Shortly after, Japan annexed three eastern Mongolian leagues into this new puppet state. Hostilities between the Republic of China and Japan ended temporarily with the Tanggu Truce signed in May 1933. Public opinion in China rejected these harsh terms, creating lingering tensions. Japanese territorial ambitions continued to escalate throughout the early 1930s despite official agreements.
Prince Demchugdongrub met Japanese commanders in Xinjing during October 1935 to discuss cooperation. He sought autonomy from the Kuomintang government while Japan wanted to use him against Chinese control. By February 1936, Prince De proclaimed the Mongol Military Government during a grand ceremony. The new administration adopted Genghis Khan's birthday as its calendar system. Prince De swore to recover original Mongol lands and complete national revival. Plans immediately expanded beyond northern Chahar province toward neighboring Suiyuan territory. The Inner Mongolian Army formed around forces loyal to Prince Demchugdongrub and other nobles. Li Shouxin's detachment from the Manchukuo Imperial Army joined Prince De's command structure. Wang Ying created the Grand Han Righteous Army with about 6,000 hastily recruited men. These collaborationist units received weapons and training from Japanese advisers embedded within each group.
Japanese intelligence operatives worked in Suiyuan for months before the invasion began. The main Mongolian force numbered approximately 10,000 soldiers divided into eight divisions. Most of these troops remained poorly armed despite Japanese assistance. Li Shouxin's detachment stood out as relatively well equipped and decently trained compared to others. Wang Ying's Grand Han Righteous Army consisted mostly of low-quality bandits who lacked discipline. Disunity and insufficient training severely damaged morale among the coalition forces. Chinese National Revolutionary Army garrisons received reinforcements from Nanjing including an elite anti-aircraft battalion. Four Japanese planes were shot down during raids prior to the campaign's start. The opposing Chinese forces totaled roughly 45,000 men across the 35th and 19th Armies plus local units. This numerical advantage combined with better preparation gave defenders a significant edge over invaders.
First contact between Nationalist and Inner Mongolian forces occurred at Hongort on November 14. A large Mongolian attack launched the next day failed against city defenses. Assaults continued over subsequent days but resulted in considerable casualties for attackers. Snowstorms hampered a final attempt on November 16 that also proved unsuccessful. On November 17, Chinese counterattacks surprised invaders forcing disorganized retreat toward Bailingmiao headquarters. General Fu Zuoyi's 35th Army executed flanking movements west of Mongolian positions before attacking directly. Suicide assaults broke through city gates using trucks as battering rams. The defending Inner Mongolian 7th Cavalry Division suffered heavy losses while retreating. Casualties reached three hundred to nine hundred killed along with three hundred wounded and captured prisoners. Nationalists seized bags of flour, petrol cans, rifles, machine guns, motor vehicles, and field guns from enemy supplies. These captured items later served as evidence proving Japanese involvement in the operation.
Defeat of Japan's proxy forces encouraged many Chinese to push for active resistance. Victory celebrations spread across China and shocked international press coverage. This marked the first time the Chinese army successfully stopped a Japanese-supported force. Delegations arrived from southern provinces urging defenders to maintain their fight. Foreign Minister Hachirō Arita claimed Japan had no involvement despite captured weapons showing otherwise. The Xi'an Incident followed these events leading to Kuomintang-Communist cooperation against Japan. Prince Demchugdongrub retreated to northern Chahar where he rebuilt his shattered army. New regulations improved performance while recruitment began again for fresh soldiers. By July 1937 when war officially broke out, his force grew to 20,000 men in eight cavalry divisions. Small-scale fighting continued until open hostilities emerged from the Marco Polo Bridge Incident. Photographer Fang Dazeng documented the warzone with images now held at the National Museum of China.
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Common questions
What was the outcome of the Suiyuan campaign in November 1936?
Chinese National Revolutionary Army forces defeated the invading Inner Mongolian and Japanese-backed coalition. The defenders repelled attacks on Hongort and forced a disorganized retreat by enemy troops toward Bailingmiao headquarters.
Who led the opposing forces during the Suiyuan campaign?
Prince Demchugdongrub commanded the Inner Mongolian Army while General Fu Zuoyi led the defending Chinese 35th Army. Li Shouxin and Wang Ying also provided key leadership for collaborationist units within the invading force.
When did the main fighting occur during the Suiyuan campaign?
First contact between Nationalist and Inner Mongolian forces occurred at Hongort on the 14th of November 1936. Major assaults continued through the 17th of November before Chinese counterattacks forced an enemy retreat.
How many soldiers participated in the Suiyuan campaign?
The main Mongolian force numbered approximately 10,000 soldiers divided into eight divisions. Opposing Chinese forces totaled roughly 45,000 men across the 35th and 19th Armies plus local units.
Why did the Suiyuan campaign end with a Japanese defeat?
Disunity and insufficient training severely damaged morale among the coalition forces despite Japanese assistance. The numerical advantage combined with better preparation gave defenders a significant edge over invaders.