Conquest of Koshu

Japanese: 甲州征伐 - こうしゅうせいばつ

This is the battle in 1582 (Tensho 10) in which Oda Nobunaga destroyed Takeda Katsuyori of Kai. Katsuyori, who succeeded the Takeda clan after Shingen's death in 1573 (Tensho 1), was defeated by the combined forces of Oda Nobunaga and Tokugawa Ieyasu at the Battle of Nagashino in 1575, and the Takeda clan began to decline after that. In response, Nobunaga raised an army to pursue the Takeda clan in February 1582, and the main force of Oda Nobutada's army advanced from Kisoguchi and Iwamuraguchi, capturing the castles of Ina one after another. Ieyasu also began an attack from Surugaguchi, and made an ally of Anayama Baisetsu, a member of the Takeda clan. Under these circumstances, Katsuyori, who had marched to Suwa, returned to Shinpu Castle, which he had built the previous year, on February 28, and on March 3, following the advice of Oyamada Nobushige, the lord of the county, he set fire to the castle and headed for Iwadono Castle in Otsuki.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

1582年(天正10)に織田信長が甲斐の武田勝頼を滅ぼした戦い。1573年(天正1)信玄の没後武田家をついだ勝頼は，75年に長篠の戦で織田信長，徳川家康の連合軍に敗れ，以後武田家は衰退に向かった。これに対し信長は82年2月に武田氏追討の兵をおこし，主力の織田信忠軍は木曾口と岩村口から進撃して，伊那の諸城を次々に陥れた。また家康も駿河口から攻撃を開始し，武田氏の一族穴山梅雪を味方にした。こうした状況の中で諏訪まで出陣していた勝頼は，2月28日に前年より築城していた新府城に帰り，3月3日には郡内の領主小山田信茂の意見に従い城に火を放ち大月の岩殿城に向かった。

出典　株式会社平凡社世界大百科事典第２版について　情報

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