Battle of Kumegawa

What Happened

On 24 June 1333, two armies met at the Kumegawa crossing on the Yanase River, in what is now the city of Higashimurayama in western Tokyo. The imperial forces were commanded by Nitta Yoshisada, a warrior who had turned against the Kamakura Shogunate earlier that year. The shogunate's army was led by Sakurada Sadakuni, a retainer of the ruling Hōjō family.

The fight came one day after the nearby Battle of Kotesashi, and it was fought at the foot of the Hachikokuyama ridge. Nitta's troops pressed the attack and broke the shogunate line. Sakurada Sadakuni's force fell back eastward, and the pursuit carried on to the next engagement at Bubaigawara.

The battle belongs to the Kōzuke-Musashi Campaign, the push through the Kantō plain that decided the fate of the shogunate. It fell in the second year of the Shōkyō era, during the Kenmu Restoration period.

Background

The Kamakura Shogunate had governed Japan since the late twelfth century, with the Hōjō family holding real power as regents behind a line of figurehead shōguns. By 1333 the regime faced a coalition of enemies: Emperor Go-Daigo, who had been trying to restore direct imperial rule, and disaffected warrior houses who resented Hōjō dominance.

Nitta Yoshisada raised his banner against Kamakura in the spring of 1333. His route took him across the Kantō plain, the flatland surrounding the shogunate's capital, gathering strength as local families chose sides. The Hōjō responded by sending armies out to stop him before he could reach Kamakura itself.

The Kōzuke-Musashi Campaign was the sequence of battles that resulted. Kotesashi, fought the day before Kumegawa, was the first clash of that sequence. Kumegawa was the second, and Bubaigawara, the next in line, was the third. Each engagement pushed Nitta's army closer to the shogunate's capital.

Why It Mattered

Kumegawa was not a decisive battle on its own, but it kept Nitta Yoshisada's advance moving at a moment when the campaign's momentum mattered more than any single victory. A shogunate victory here could have stalled the march on Kamakura and given the Hōjō time to organise a stronger defence.

Instead, Sakurada Sadakuni's defeat forced the shogunate's forces into a retreat that ended at Bubaigawara. The pattern of the campaign — a string of imperial victories across Musashi and Sagami provinces — carried Nitta's army to Kamakura, and the Kamakura Shogunate fell within weeks. The collapse ended Hōjō regency rule and opened the Kenmu Restoration, the period in which Emperor Go-Daigo attempted to govern directly.

The battle also illustrates how the Genkō War was won: not by one grand engagement but by a rapid series of encounters in which local warrior bands joined the side that appeared to be winning. Each victory like Kumegawa made the next defection easier.

The Name in Japanese

The battle is written 久米川の戦い and read くめがわのたたかい (Kumegawa no tatakai).

Breaking it down:

• 久 — read ku here. The character means "long" or "lasting," as in something that endures over time.
• 米 — read me here. It means "rice," the grain. In place names it often appears purely for its sound rather than its meaning.
• 川 — read gawa here (the base reading is kawa; it voices to gawa in compounds). It means "river."
• の — read no. The possessive particle, linking the place name to the noun that follows. It works like "of" or the apostrophe-s in English.
• 戦 — read tatakai. It means "battle" or "war." This is the noun form of the verb 戦う (tatakau), "to fight."
• い — read i. The hiragana that completes the reading of 戦い.

So 久米川 (Kumegawa) is the river name, の marks it as the location, and 戦い is the word for the battle itself. The full phrase means "the Battle of Kumegawa." The name is a compound: 久米 (Kume) plus 川 (kawa, "river"), with the k voicing to g in the middle of the compound — a common sound change in Japanese place names.

Key Figures

Nitta Yoshisada (新田義貞) commanded the imperial forces at Kumegawa. A warrior of the Nitta branch of the Minamoto clan, he turned against the Kamakura Shogunate in 1333 and led the Kōzuke-Musashi Campaign across the Kantō plain. His advance from Kotesashi through Kumegawa and Bubaigawara ended with the fall of Kamakura.

Sakurada Sadakuni (桜田貞国) led the shogunate's army at Kumegawa. A retainer of the Hōjō Regency, he was tasked with halting Nitta's march. His defeat at the Yanase River forced his forces into retreat toward Bubaigawara, where the campaign continued.