Battle of Bubaigawara

Monument marking the site of the Battle of Bubaigawara

Date	May 15–16, 1333
Location	Bubaigawara, in present-day Fuchū, Tokyo 35°40′06″N 139°28′07″E / 35.66833°N 139.46861°E / 35.66833; 139.46861
Result	Victory for the imperial forces

Belligerents

Forces loyal to the Kamakura Shogunate

Forces loyal to the Emperor Go-Daigo

Commanders and leaders

Hōjō Yasuie

Hōjō Sadakuni

Nitta Yoshisada

Strength

207,000

100,000

The Battle of Bubaigawara (分倍河原の戦い, Bubaigawara no tatakai^?) was part of the decisive Kōzuke-Musashi Campaign during the Genkō War in Japan that ultimately ended the Kamakura Shogunate. It was fought on the banks of the Tama River in central Musashi province in what is now part of the city of Fuchū, Tokyo on May 15 and 16, 1333, it pitted the anti-shogunate imperial forces led by Nitta Yoshisada against the forces of the Hōjō-led Kamakura shogunate. It was the final major battle in Kōzuke-Musashi Campaign and was preceded by the Battle of Kumegawa.

After his victory three days earlier at the Battle of Kumegawa, Nitta Yoshisada took time to rest his horses and men. Meanwhile, the forces loyal to the Shogunate retreated to Bubaigawara to regroup. Unbeknownst to Nitta, the Shogun's forces had received reinforcements on the 14th greatly restoring strength and morale.

As the Imperial forces advanced on Bubaigawara on the 15th, the Shogun's forces attacked with a great archery barrage and thus halted the Imperial attack. The main body of the Shogun's army then engaged Nitta's army, and despite aggressive counterattacks by Nitta, heavy losses forced Nitta to retreat.

Had the Shogunate forces immediately pressed their advantage of the first day, it was likely their victory would have been complete. However, during the night of the 15th, Nitta received critical reinforcements led by Miura Yoshikatsu. And at dawn on the 16th, Miura led his fresh troops and attacked an unsuspecting enemy. Nitta Yoshisada and his brother Nitta Yoshisuke advanced to the front while Miura harassed the enemy from the rear.

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