What was the October Incident (1931)?


The October incident (十月事件, Jūgatsu Jiken), also known as the Imperial Colours incident (錦旗革命事件, Kinki Kakumei Jiken), was an abortive coup d’état attempt in Japan on 21 October 1931, launched by the Sakurakai secret society within the Imperial Japanese Army (IJA), aided by civilian ultranationalist groups.

Refer to March Incident (1931), October Incident (1931), May 15 Incident (1932), Military Academy Incident (1934), February 26 Incident (1936), Control Faction, and Imperial Way Faction.


Having failed to replace the government with a totalitarian military dictatorship in the abortive coup d’état of the March Incident of March 1931, Lieutenant Colonel 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 authorisation from the IJA General Staff Office and over the ongoing objections of the Japanese civilian government, Captain 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”. 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:

  • Key statesmen and officials such as Prime Minister Wakatsuki Reijirō, Grand Chamberlain Saitō Makoto, Prince Saionji Kinmochi, and Lord Keeper of the Privy Seal Makino Nobuaki, and Foreign Minister Kijūrō Shidehara were to be assassinated.
  • The Imperial Palace, Tokyo Metropolitan Police Headquarters, and other key government buildings were to be seized by troops loyal to the Sakurakai
  • A new cabinet would be formed under the auspices of General Sadao Araki, chief of the radical Imperial Way Faction. The new government would ban political parties, and would consolidate the recent territorial gains of Japan in Manchuria.
  • The Emperor would be forced to accept this Shōwa Restoration even if under threat of violence.

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 General 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 General 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 Colours 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.


Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.