1584: The Battle of Komaki-Nagakute

Hashiba Hideyoshi's army and the allied forces of Tokugawa Ieyasu and Oda Nobukatsu confronted one another mainly in Owari Province, beginning a campaign that lasted about eight months.

Sources　小牧市「小牧・長久手の合戦」／長久手市「長久手古戦場物語」／長久手市「小牧・長久手の戦い 石作神社」

Oda Nobukatsu put three of his own senior retainers to death on the charge that they had been in contact with Hashiba Hideyoshi. The killings amounted to a declaration of war on Hideyoshi, and Nobukatsu joined with Tokugawa Ieyasu.

Sources　国立公文書館「小牧・長久手の戦い（徳川家康——将軍家蔵書からみるその生涯）」

Ryūzōji Takanobu and the allied forces of Arima Harushige and Shimazu clashed intensely at Okitanawate. Shimazu forces exploited the marshland to repel Ryūzōji's army and killed Takanobu.

Sources　島原市公式「沖田畷合戦場跡」

Tokugawa commanders including Sakai Tadatsugu defeated Mori Nagayoshi's force after it advanced to Haguro.

Sources　小牧市「小牧・長久手の合戦」／長久手市「長久手古戦場物語」／長久手市「小牧・長久手の戦い 石作神社」

Tokugawa Ieyasu pitched camp on Komakiyama while Hashiba Hideyoshi took position at Gakuden, and the two armies faced each other. The National Archives of Japan puts the Nobukatsu–Ieyasu force at about seventeen thousand men and Hideyoshi’s at one hundred thousand (sixty thousand by another account).

Sources　国立公文書館「小牧・長久手の戦い（徳川家康——将軍家蔵書からみるその生涯）」／名古屋市博物館「小牧長久手の戦い」

Tokugawa Ieyasu's army defeated a detached Hashiba force at Nagakute, where Ikeda Tsuneoki and Mori Nagayoshi were killed.

Sources　小牧市「小牧・長久手の合戦」／長久手市「長久手古戦場物語」／長久手市「小牧・長久手の戦い 石作神社」

Takigawa Kazumasu entered Kanie Castle from the sea with the Kuki fleet and seized it by winning over the retainer left in charge of the castle. The allied army of Oda Nobukatsu and Tokugawa Ieyasu counterattacked and retook it after a siege of two weeks.

Sources　蟹江町「蟹江城址」／蟹江町「蟹江合戦とは？（蟹江町歴史民俗資料館 おうちミュージアム）」

Sassa Narimasa of Etchū attacked Suemori Castle in Noto and Maeda Toshiie drove him off. The castle was held by Toshiie’s retainer Okumura Nagatomi, and Ishikawa Prefecture notes that this victory is said to be why the Maeda came to hold Kaga at a million koku.

Sources　石川県「赤蔵山・末森城跡」／金沢大学「石川デジタルミュージアムネットワーク：末森城跡」

Date Terumune retired and passed leadership to Date Masamune, who became head of the Date clan at age eighteen.

Sources　仙台市博物館「主な収蔵品11 伊達政宗に関する資料（1）」