March Incident

March Incident
Name	March Incident
Date	March 1931 (attempt)
Place	Tokyo, Empire of Japan
Result	Failed coup attempt; purge of conspirators
Combatant1	Imperial Japanese Army factions
Combatant2	Imperial Japanese Government loyalists
Commander1	Kazushige Ugaki (alleged plot target)
Commander2	Prime Minister of Japan (office)

March Incident The March Incident was a failed 1931 coup attempt in Tokyo by ultranationalist officers of the Imperial Japanese Army aimed at overthrowing civilian leadership and installing an authoritarian regime sympathetic to expansionist policies. The plot involved conspiratorial networks within the Kantō Military District, collusion with fascist societies, and interaction with right-wing intellectuals and political figures active in the late Taishō period and early Shōwa period. The incident presaged further upheavals culminating in the May 15 Incident and the February 26 Incident and influenced Japan's trajectory toward Second Sino-Japanese War and Pacific War policies.

Background

In the late 1920s and early 1930s, factions within the Imperial Japanese Army and right-wing organizations sought to replace parliamentary cabinets associated with the Genrō and Seiyūkai leadership with a regime aligned to a conception of kokutai promoted by groups like the Sakurakai and the Ketsumeidan. Economic strain from the Great Kantō Earthquake aftermath and global Great Depression pressures intensified militarist sentiment among officers influenced by thinkers linked to Yoshinori Shirakawa supporters, Sadao Araki adherents, and publicists from periodicals such as Kokuhonsha journals. Attempts to secure backing from senior figures including members of the House of Peers and industrialists connected to zaibatsu houses—Mitsui, Mitsubishi, Sumitomo—were a recurring feature of conspiratorial planning.

Events of the Incident

Conspirators organized plans to seize key installations in Tokyo and arrest cabinet members, routing authority through a military junta sympathetic to expansionists favoring intervention in Manchuria and stronger ties to Kwantung Army ambitions. Communications passed through intermediaries with ties to the Tokyo Metropolitan Police Department and ultranationalist societies, while coup cells coordinated with officers stationed at Imperial Japanese Army Academy outposts and units drawn from the 34th Division and other formations. The plot unraveled when leaks emerged involving contacts with politicians in the Rikken Seiyūkai and Rikken Minseitō factions, prompting arrests by the Metropolitan Police and intervention by top Imperial General Headquarters staff. High-profile trials and disciplinary boards convened under statutes influenced by the Peace Preservation Law framework.

Key Figures

Participants and implicated personalities included mid-ranking officers associated with the Sakurakai and influential ideologues sympathetic to National Socialist models admired in contemporary Italy and Germany. Notable military officers and civilian sympathizers—some with links to Kwantung Army adventurism, the Rokumeikan-era network, and conservative peers—featured in investigations led by prosecutors from offices related to the Ministry of Justice and judges connected to the Supreme Court of Judicature of Japan. Figures in adjacent incidents, such as those tied to the May 15 Incident perpetrators and the February 26 Incident conspirators, shared networks of mentorship, including veterans of the Russo-Japanese War and proponents of the Kwantung Army's independent policies in Manchuria.

Political and Military Responses

The Cabinet and the Imperial Household Agency navigated the crisis with input from the Emperor's advisors and the Imperial Japanese Navy, which monitored army factionalism with concern given competing strategic visions involving the South Manchuria Railway Company and colonial administration in Korea. Senior statesmen, including members of the elder Genrō circle and party leaders from Rikken Seiyūkai and Rikken Minseitō, debated emergency measures while the Ministry of War enacted purges and reassignment orders targeting suspect regimental commanders. Diplomatic repercussions prompted memos between the Foreign Ministry and missions in Beijing (then referred to in diplomatic dispatches as Peking) and Shanghai, as foreign legations monitored instability affecting treaty relations established after the Washington Naval Conference.

Aftermath and Consequences

Although the coup failed, prosecutions and courts-martial produced sentences that many contemporaries considered lenient, allowing some officers to return to service and influence, contributing to a pattern seen in the May 15 Incident aftermath. The incident weakened civilian cabinets and emboldened factions favoring aggressive policies in Manchuria that led to the Mukden Incident-era developments and the establishment of Manchukuo. Links between military conspirators and nationalist media, ultranationalist youth groups, and conservative elites accelerated the erosion of parliamentary authority, facilitating later policies culminating in alliances with Nazi Germany and Fascist Italy and Japan’s full-scale entry into conflict across East Asia and the Pacific.

Historical Interpretation and Legacy

Historians situate the March attempt within broader scholarship on Japanese militarism, authoritarianism, and interwar radicalism, drawing on archival materials from the National Diet Library, police dossiers, and contemporary press such as Asahi Shimbun and Yomiuri Shimbun. Comparative studies relate the incident to European coup attempts and paramilitary politics in the 1920s and 1930s, including analysis alongside Beer Hall Putsch and Italian March on Rome influences. Debates persist about the extent of tacit endorsement by conservative elites and the Emperor system; revisionist and consensus historians cite differing weights to institutional failures, economic crisis impacts, and ideological diffusion via societies like Kokuhonsha. The event remains a focal point in examinations of how mid-level military networks can precipitate systemic shifts in national policy and contributes to the historiography of Japan’s road to war.

Category:1931 in Japan