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| First Chōshū Expedition | |
|---|---|
| Name | First Chōshū Expedition |
| Date | 1864 |
| Place | Chōshū Domain, Japan |
| Result | Tokugawa shogunate tactical victory; strategic stalemate leading to Second Chōshū Expedition |
| Combatant1 | Tokugawa shogunate |
| Combatant2 | Chōshū Domain |
| Commander1 | Tokugawa Yoshinobu; Tokugawa Iemochi; Katsu Kaishū; Itō Hirobumi |
| Commander2 | Mōri Takachika; Kido Takayoshi; Ōmura Masujirō |
| Strength1 | Shogunate forces, allied domains |
| Strength2 | Chōshū forces, irregulars |
| Casualties1 | moderate |
| Casualties2 | moderate |
First Chōshū Expedition
The First Chōshū Expedition was an 1864 punitive campaign by the Tokugawa shogunate and allied domains against the Chōshū Domain on the western end of Honshū, Japan, linked to the larger turmoil of the Bakumatsu period and the Meiji Restoration. The operation followed incidents involving the Kōbu gattai faction, imperial courtiers, and maritime confrontations, and it presaged later conflicts including the Second Chōshū Expedition and the Boshin War. The expedition involved naval engagements, land blockades, and sieges that highlighted the clash between traditional samurai forces and modernized units influenced by Western military technologies and foreign advisors.
The campaign arose amid the late Edo period realignment where domains like Chōshū Domain and Satsuma Domain challenged shogunal authority after incidents such as the Sonnō jōi movement and attacks on foreign legations including the Bombardment of Kagoshima, the Anglo-Satsuma War, and the Shimonoseki Campaign. The Bunkyū and Ansei political crises, involving figures like Ii Naosuke, Sakamoto Ryōma, and Saigō Takamori, had weakened centralized control, while treaties such as the Ansei Treaties and events like the Namamugi Incident intensified domain rivalries. Chōshū's 1863 seizure of foreign ships and firing on foreigners at Shimonoseki Strait brought pressure from the United States Navy, Royal Navy, and French Navy, influencing shogunal policy and domain diplomacy.
Political polarization between the Kōbu gattai court faction and the Sonnō jōi loyalists underpinned the confrontation, as did machinations at the Imperial Court in Kyoto involving the Kōshū retainers and courtiers such as Yoshida Shōin affiliates. Chōshū's expulsion of foreign envoys and the seizure of the Kure-area shipping prompted the shogunate, seeking to assert prestige after the Shogunal fleet modernization push led by figures like Sakai Tadakiyo and Katsu Kaishū, to mobilize allied domains including Aizu Domain, Tsu Domain, and Hizen Province contingents. The Kinmon Incident (also called the Gate Incident) and Chōshū's hosting of anti-shogunate imperial princes were immediate triggers that justified punitive action by bakufu commissioners and allied daimyo.
The expedition combined naval blockade operations in the Seto Inland Sea and land forces advancing into Chōshū territory around Hagi and Shimonoseki. Shogunate-aligned fleets, featuring modern warships influenced by Dutch shipbuilding and British Royal Navy models, shelled coastal batteries and supported amphibious assaults. Skirmishes included actions near Kōbe supply routes and clashes around mountain passes defended by Chōshū samurai trained under reformers like Ōmura Masujirō and influenced by instructors from France and the Netherlands. Notable encounters saw the use of rifled artillery, shore batteries, and fortified positions at Nakashima and Mitajiri, while irregular forces conducted raids and guerrilla-style defenses in the inland countryside. The campaign ended without a decisive territorial annexation, as logistical limits and political considerations constrained a full pacification.
Shogunate forces comprised domain troops from Aizu Domain, Kaga Domain, Tsu Domain, and others, coordinated by shogunal officers including Katsu Kaishū and shogun representative envoys tied to Tokugawa Iemochi and Tokugawa Yoshinobu. Chōshū defenders included retainers loyal to the Mōri family and modernization advocates such as Kido Takayoshi and Nakaoka Shintarō. Equipment on both sides mixed traditional arms—katana, yari, and tanegashima matchlocks—with newer imports: rifled muskets, field artillery, and steam-powered ships procured from Great Britain, France, and the Netherlands. Military reformers like Ōmura Masujirō had pushed for Western-style drill and organization, while foreign military missions to Japan influenced Chōshū training and tactics.
Casualty figures were limited compared with later conflicts but included killed and wounded among samurai, ashigaru, and sailors from both sides; civilian losses occurred in towns such as Hagi and rural hamlets affected by foraging and scorched-earth tactics. Coastal bombardments damaged merchant shipping and port infrastructure in the Seto Inland Sea trading network, affecting merchants tied to Osaka and Hiroshima markets. The expedition strained domain resources, displaced families, and contributed to famine pressures in areas already coping with peasant unrest and fiscal deficits documented in domain registers.
Though the shogunate won a tactical success and extracted temporary concessions, the expedition failed to eliminate Chōshū's resistance or its political influence at the Imperial Court, accelerating alignments that culminated in the Satsuma–Chōshū Alliance and the eventual overthrow of the Tokugawa in the Boshin War. Prominent leaders from both sides—Kido Takayoshi, Ōmura Masujirō, Itō Hirobumi, and former shogunate reformers—later shaped the Meiji government and modernization policies. Internationally, the episode underscored the limits of shogunal authority in controlling coastal interactions with the United States, United Kingdom, and France, and influenced subsequent foreign missions such as those led by Eugène Collache-era advisors and maritime treaties renegotiations. The expedition thus stands as a pivotal episode linking domain military modernization, court politics, and the transition from the Edo period to the Meiji era.