Jōkyū War

In the beginning of the 13th century, Emperor Go-Toba found his attempts at political maneuvers blocked by the Kamakura shogunate.

Seeking independence, and the power he considered rightfully his as the ruler of Japan, Go-Toba gathered allies in 1221, and planned to effect an overthrow of the shogunate.

[3] In the fifth lunar month of 1221, the Retired Emperor Go-Toba decided on lines of succession, without consulting the shogunate and powerful Hojo clan.

[2] Hōjō Yoshitoki decided to launch an offensive against Go-Toba's forces in Kyoto, using much the same three-pronged strategy as was employed a few decades earlier.

[2] These forces faced meager opposition and resistance on their way to the capital; the Imperial commanders were simply outfought.