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The 1580 Battle of Omosu (Omosu no Tatakai) was one of many conflicts between the Hojo and Takeda clans during Japan's Sengoku period. What sets this battle apart is its rarity as one of the few naval engagements in pre-modern Japan. The conflict occurred off the coast of the Izu Peninsula, involving the fleets of Hojo Ujimasa, the leader of the Hojo clan, and Takeda Katsuyori, the head of the Takeda clan.

In a covert operation, the Fūma ninja, led by Fūma Kotarō, infiltrated and attacked a Takeda camp during the night. This surprise assault created chaos and confusion among the Takeda forces, leading them to turn on one another, causing significant casualties.

As the naval standoff continued, the land armies of both clans advanced towards each other. Ultimately, the Hojo clan emerged victorious.

 


See also

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