On August 20, 1570, the Battle of Imayama unfolded in Kyushu. Similar to the renowned Battles of Okehazama (1560) and Kawagoe (1545), the Imayama clash stands as a remarkable instance of surprise attacks during the Sengoku Period.
The Otomo and Ryuzoji clans, long-standing rivals and dominant powers in northern Kyushu, found themselves in a fierce rivalry. In that fateful August of 1570, Otomo Sorin rallied an immense force of approximately 60,000 samurai, commanded by his younger brother, Chikasada. Their goal was to decisively defeat their rival, Ryuzoji Takanobu.
Anticipating the looming assault, Ryuzoji Takanobu guided a modest contingent into Saga Castle. As the Otomo forces laid siege to the castle, a pivotal realization dawned upon Nabeshima Naoshige, the master of Saga Castle. Recognizing the Otomo's overconfidence and lack of preparation due to their overwhelming numbers, he devised a countermove. Capitalizing on the cover of darkness, he stealthily led a small group out of the castle, embarking on a daring assault against Chikasada's headquarters. This audacious maneuver culminated in the demise of Chikasada himself. The impact of this unexpected strike sent shockwaves through the Otomo ranks, causing disorder and chaos. Bereft of leadership, the Otomo forces were compelled to retreat in disarray.
See also
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The Siege of Unokuchi Castle
One of the important steps in the career of every Japanese commander was the uijin, the first military campaign in which he took part. For the legendary Takeda Shingen, according to some sources, this campaign was the siege of Unokuchi Castle.
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Battle of Arita-Nakai
By 1517, Takeda Motoshige, lord of Kanyama Castle, was probably the most influential daimyo in Aki Province. Ten years earlier, he had served as a vassal of the Ōuchi clan and participated in Ōuchi Yoshiyuki's campaign in Kyoto. This campaign was part of an effort to support the deposed shogun Ashikaga Yoshitane.
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The Siege of Arai Castle
Hojo Nagauji (Soun) (1432–1519) went down in Japanese history as one of the most notable figures of his time. He is considered a prime example of a gokoku-jo daimyo. The process of gokoku-jo literally means “the lower classes defeat the upper classes” and in Japanese history was expressed, among other things, in the elevation of minor samurai to the status of owners of entire provinces.
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Battle of Sakai
Ōuchi Yoshihiro was an influential shugo of the provinces of Suō and Nagato and played an important role as a supporter of the Ashikaga clan during the war with the Southern Court. His greatest achievement was forcing the Southern Court emperor to surrender in 1392, which brought an end to the Nanboku-chō period. This victory strengthened the Ashikaga clan's position and marked the end of the long-standing rivalry between the two imperial lines.
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Battle of Shijonawate
After Kusunoki Masashige's death in the Battle of Minatogawa, his son, Kusunoki Masatsura, continued his work supporting the Southern Imperial Court in the Nanboku-chō period war. He took on his father's legacy not only as a duty, but also as a way to remain faithful to the ideals for which Masashige had given his life.
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Battle of Minatogawa
After his defeat by Nitta Yoshisada in 1336, Ashikaga Takauji completely restored his forces and secured the support of three powerful clans in Kyushu: the Sōni, Shimazu, and Otomo. In addition, he received significant reinforcements from Shikoku Island under the command of Hosokawa. Having thus strengthened his army, Ashikaga Takauji marched on Kyoto.
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The Siege of Tihaya Castle
Tihaya Castle was built by Kusunoki Masashige on top of Mount Kongo, separated from the neighboring hills by a deep ravine. The terrain itself provided natural protection, making the position extremely convenient for defense.
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The Siege of Akasaka Fort
Kusunoki Masashige, hero of the Genko Rebellion (1331–1333), was a talented commander and inventive strategist. The two sieges of castles where he acted as defender are inscribed in gold letters in the history of Japanese military art.
