Mukden Incident Site (September 18th History Museum)

The Mukden Incident (also known as the Manchurian Incident or the September 18th Incident) occurred on the night of September 18, 1931, near Mukden (modern-day Shenyang) in northeastern China. It was a carefully orchestrated false flag operation planned by officers of Japan's Kwantung Army, most notably Colonel Seishirō Itagaki and Lieutenant Colonel Kanji Ishiwara, who sought to create a pretext for the military conquest of Manchuria.

Lieutenant Suemori Kawamoto of the 3rd Company, 2nd Battalion of the Independent Garrison Unit detonated a small quantity of dynamite along a section of the South Manchuria Railway near Liutiao Lake (柳条湖). The explosion was deliberately minor — it damaged only a 1.5-meter section of rail on one side, and a southbound train from Changchun passed over the site without incident just minutes later. Despite the trivial nature of the damage, the Japanese military immediately blamed Chinese soldiers from the nearby Beidaying garrison.

Using the fabricated incident as justification, Japanese forces launched a full-scale assault on Mukden that same night. Artillery opened fire on the Chinese garrison, and by the following morning Japanese troops had occupied key positions throughout the city. Zhang Xueliang, the Chinese commander in the region, had ordered his forces not to resist, following Chiang Kai-shek's policy of non-confrontation with Japan. Within five months, Japanese forces had conquered all of Manchuria.

The occupation led to the establishment of Manchukuo in March 1932, a puppet state nominally headed by Puyi, the last emperor of the Qing dynasty. The League of Nations condemned the invasion and refused to recognize Manchukuo, prompting Japan to withdraw from the organization in March 1933. The Mukden Incident is widely regarded as the opening act of Japanese military aggression that ultimately led to the Second Sino-Japanese War (1937) and Japan's involvement in World War II.

The site is now home to the September 18th History Museum (九・一八歴史博物館), which grew out of the "broken calendar" monument and underground exhibition hall opened in 1991; expansion began in September 1997 and the enlarged museum opened on September 18, 1999. Covering 35,000 square meters with seven exhibition halls, it is a museum dedicated specifically to the Mukden Incident. The museum's iconic entrance features a massive stone calendar turned to September 18, 1931. Every year on the anniversary, air-raid sirens sound across Shenyang and a bell is rung 14 times — representing the 14 years of Japanese occupation of northeastern China (1931-1945).