Key Facts
- Duration
- 1614–1615 (two campaigns)
- Campaigns
- Winter campaign (1614) and Summer campaign (1615)
- Result
- Destruction of the Toyotomi clan
- Era name change
- Keichō changed to Genna after the siege
Strategic Narrative Overview
The conflict unfolded in two phases. The Winter Campaign of 1614 saw Tokugawa forces besiege Osaka Castle but fail to take it by storm, leading to a negotiated truce. The Toyotomi accepted terms that included the filling of the castle's outer moats. When hostilities resumed in the Summer Campaign of 1615, the castle's defenses were compromised and Tokugawa armies broke through, storming and burning Osaka Castle in a decisive assault.
01 / The Origins
Following the death of Toyotomi Hideyoshi in 1598, Tokugawa Ieyasu gradually consolidated power and established the Tokugawa shogunate in 1603. The Toyotomi clan, based at Osaka Castle, retained significant wealth and prestige and posed a symbolic challenge to Tokugawa authority. Tensions escalated as Ieyasu sought a pretext to eliminate the clan, eventually citing an inscription on a temple bell commissioned by Toyotomi Hideyori as an act of deliberate provocation.
03 / The Outcome
Osaka Castle fell in June 1615 and Toyotomi Hideyori died during the final battle, along with his mother Yodo-dono. The Toyotomi lineage was extinguished, removing all remaining rivals to Tokugawa hegemony. The era name was changed to Genna to mark the peace, an event known as the Genna Armistice. The Tokugawa shogunate subsequently ruled Japan without significant armed opposition for over two and a half centuries.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Tokugawa Ieyasu, Tokugawa Hidetada.
Side B
1 belligerent
Toyotomi Hideyori, Yodo-dono.
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.