The, also known as the, was an abortive coup d'état attempt in the Empire of Japan on 21 October 1931, launched by the Sakurakai secret society within the Imperial Japanese Army, aided by civilian ultranationalist groups.
Having failed to replace the government with a totalitarian military dictatorship in the abortive coup d'état of the March Incident of March 1931, Lt. Col. Kingoro Hashimoto of the Sakurakai and his ultra-nationalist civilian supporters, including Shūmei Ōkawa, resolved to try again in October 1931.
Soon after the Japanese invasion of Manchuria by the Kwantung Army, without prior authorization from the Imperial Japanese Army General Staff Office and over the ongoing objections of the Japanese civilian government, Capt. Isamu Chō returned secretly to Japan (without orders) from North China to lead the plot to "prevent the government from squandering the fruits of our victory in Manchuria".[1] He was able to recruit the support of 120 members of the Sakurakai, ten companies of troops from the Imperial Guards and ten bomber aircraft from the Imperial Japanese Navy.
The main elements of the plot included:
However, younger elements within the conspiracy came to doubt their leaders and seceded from the plot. In addition, there were leaks that reached War Minister Gen. Jirō Minami. He requested Gen. Sadao Araki to pacify the malcontents. Araki thereupon attempted to reason with Hashimoto and Chō, but they refused to abandon their scheme and Araki had them arrested by the Kempeitai—military police—on 17 October 1931. The punishments for this abortive coup were even milder than for the previous March Incident, as Gen. Minami publicly excused the plot as simply an excess of patriotic zeal. Hashimoto was sentenced to 20 days house arrest, Chō to 10 days and the other ringleaders were simply transferred.
The October Incident, also known as the "Imperial Colors Incident", thus ended in apparent failure and resulted in the dissolution of the Sakurakai. However, the lightness of the punishments only encouraged more attempted military intervention in the government, cumulating with the February 26 Incident of 1936.[2]