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In 1570, Takeda Shingen, a relative of Kōsa through marriage, faced not one but three major rivals: Oda Nobunaga, Tokugawa Ieyasu, and Uesugi Kenshin. He asked the Abbot for aid, and Kōsa persuaded the Ikkō sectarians (also called "monto") in Kaga Province to rise up against Uesugi Kenshin. Several years later, after the death of Takeda Shingen, Kōsa secured the aid of the Mōri clan in fighting Oda Nobunaga and defending the Hongan-ji's supply lines from blockade.