The Siege of Chihaya began on 16 February 1333 and lasted until 22 June 1333, when the besieging forces withdrew. The castle, perched on Mount Chihaya in what is now Osaka Prefecture, was held by a small garrison under the warrior Kusunoki Masashige. Arrayed against them was a much larger army loyal to the Hōjō regents, the de facto rulers of Japan through the shogunate in Kamakura.

The siege was not a single continuous assault but a series of attempts to starve or storm the fortress. Chihaya’s position made direct attack difficult: steep slopes and natural defences meant that numerical superiority counted for little. Masashige’s garrison used hit-and-run tactics, rolling rocks and logs down the mountainside and launching night raids that kept the attackers off balance. The Hōjō forces tried to blockade the castle and cut off supplies, but the defenders had prepared stores in advance.

The siege ended not with a decisive battle but with the collapse of the attackers’ cause elsewhere. In May 1333, the shogunate’s general Ashikaga Takauji turned against Kamakura and joined the imperial side. A second army, led by Nitta Yoshisada, marched on Kamakura itself. When word reached the besieging force at Chihaya that the Hōjō had fallen, they abandoned the siege. The castle held out to the end, and Masashige emerged as one of the most celebrated commanders of the war.

Background

The siege was part of the Genkō War, a conflict fought between 1331 and 1333. The war pitted Emperor Go-Daigo against the Kamakura shogunate, whose regents from the Hōjō clan had controlled the throne’s succession for decades. Go-Daigo had attempted a coup in 1331, failed, and been exiled to the Oki Islands. He escaped in 1333 and renewed his rebellion, rallying provincial warriors to his banner.

Kusunoki Masashige, a samurai from Kawachi Province, had already distinguished himself in the war’s early phase. In 1332 he defended nearby Akasaka Castle against a Hōjō army, holding out for weeks before the castle fell. That earlier siege, known as the Siege of Akasaka, is recorded as the event immediately preceding the Siege of Chihaya. After Akasaka fell, Masashige withdrew to Chihaya, which he had fortified in advance, and prepared for a second stand.

The Hōjō regents saw Chihaya as a serious threat. Masashige’s resistance tied down a large force that might otherwise have been used against Go-Daigo’s main supporters. The longer Chihaya held, the more it encouraged other provinces to rise against Kamakura. The shogunate therefore committed substantial troops to the siege, but the mountain fortress neutralised their advantage.

Why It Mattered

The siege demonstrated that a small, determined garrison could hold a fortress against overwhelming odds, provided the terrain favoured the defender. Masashige’s success at Chihaya made him a symbol of loyalty to the imperial cause, a reputation that grew after his death in 1336 at the Battle of Minatogawa, where he chose to die rather than abandon Go-Daigo.

More immediately, the prolonged siege drained Hōjō resources and morale at a critical moment. The shogunate’s failure to take Chihaya encouraged other warriors to defect, and the defection of Ashikaga Takauji in May 1333 proved fatal. When Nitta Yoshisada captured Kamakura in June, the Hōjō regency ended, and the Kamakura period closed.

The fall of the shogunate led to the Kenmu Restoration, a brief attempt by Go-Daigo to restore direct imperial rule. That restoration lasted from 1333 to 1336 and ended when Takauji turned against the emperor and founded the Ashikaga shogunate. Chihaya thus stands at the hinge between two eras: the last major Hōjō campaign and the beginning of a new political order.

The Name in Japanese

The Japanese name is 千早城の戦い, read in kana as ちはやじょうのたたかい. In romaji, it is Chihaya-jō no Tatakai.

Breaking the name down character by character:

• 千 (ち, chi): meaning “thousand.” In this word it is part of the place name Chihaya and carries no independent numerical sense.
• 早 (はや, haya): meaning “early” or “fast.” Together with 千 it forms 千早 (ちはや, Chihaya), the name of the mountain and castle. The compound as a whole is a proper noun and is not parsed for meaning.
• 城 (じょう, jō): meaning “castle.” This is the common suffix for castle names, as in Ōsaka-jō or Kumamoto-jō.
• の (no): the possessive particle, here linking the castle to the battle. It is written in hiragana and has no kanji.
• 戦い (たたかい, tatakai): meaning “battle” or “fight.” The kanji 戦 appears with its okurigana い, the part written in hiragana that completes the reading.

The full phrase therefore reads literally as “Chihaya Castle’s Battle,” or more naturally, “the Battle of Chihaya Castle.” Note that the castle itself is also called Chihaya-jō, and the mountain on which it stood gives the site its name.

Key Figures

Kusunoki Masashige (楠木正成) commanded the defenders. A samurai from Kawachi Province, he had previously held Akasaka Castle against the same enemy. His tactics at Chihaya—guerrilla raids, use of terrain, and careful stockpiling—became legendary. He later served Emperor Go-Daigo during the Kenmu Restoration and died in 1336 at the Battle of Minatogawa, where he is said to have accepted death rather than retreat.

Emperor Go-Daigo (後醍醐天皇) was the sovereign whose rebellion sparked the Genkō War. Exiled to the Oki Islands in 1331, he escaped in 1333 and returned to lead the imperial cause. His victory at Chihaya and the fall of Kamakura allowed him to attempt the Kenmu Restoration, but his rule proved short-lived.

Ashikaga Takauji (足利尊氏) was a shogunate general who defected to the imperial side in May 1333. His betrayal fatally weakened the Hōjō position and forced the abandonment of the Chihaya siege. After the Kenmu Restoration collapsed, Takauji founded the Ashikaga shogunate in 1336.

Nitta Yoshisada (新田義貞) led the army that captured Kamakura in June 1333, ending Hōjō rule. His campaign in the Kantō region drew forces away from Chihaya and sealed the shogunate’s fate. He later fought against Takauji and died in 1338.

The Hōjō regents themselves are not named individually in the surviving records of the siege, but the besieging army was raised in their name from the shogunate’s vassals across eastern Japan.