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 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:
However, younger elements within the conspiracy came to doubt their leaders and seceded from the plot. In addition there were leaks which reached War Minister, General Jirō Minami. The latter requested General Sadao Araki to pacify the malcontents. Araki there upon attempted to reason with Hashimoto and Chō, but they refused to abandon their scheme and Araki had them arrested by the Kempeitai on 17 October 1931. The punishments for this abortive coup were even milder than for the previous the 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.