The siege of Inabayama Castle (稲葉山城の戦い, Inabayama-jō no Tatakai) of 1567 was the final battle in Oda Nobunaga's campaign to defeat the Saitō clan in their mountaintop castle and conquer Mino Province, Japan.
It was a short, two-week siege, fought between 13 and 27 September 1567, or in the Japanese calendar: from the 1st to 15th day of the eighth month, in the 10th year of the Eiroku era, according to the Nobunaga Chronicle. The siege ended in a decisive battle and victory for Nobunaga's combined forces, resulting in the subjugation of the Saitō clan, their vassals, and their allies. This victory was the culmination of Nobunaga's Mino campaign, waged intermittently over the previous six years. It brought an end to the rivalry between the Oda clan of Owari Province and the Saitō clan of Mino, which began over twenty years earlier between Nobunaga's father, Oda Nobuhide and Saitō Dōsan.
Due to the weak leadership of the Saitō, many samurai leaders defected to Nobunaga before the battle, while others willingly submitted afterward. With this victory, Nobunaga took control of the expansive and fertile Mino Province and gained numerous supporters and resources.
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