After the fall of Takato Castle on March 2, remaining Takeda garrisons in Shinano Province surrendered without a fight, and Oda Nobutada's army reached eastern border of Takeda home province of Kai. At the same time, Tokugawa Iyeyasu burst into Kai from Suruga Province on the south, taking Takeda traitor Anayama Genba along as a guide. In the meantime, Takeda Katsuyori and his army of 10–15.000 in Shimpu Castle had calculated that Takato Castle would hold for some time, so the swift fall of that mighty fortress in only a day caused massive panic among Takeda supporters.
Following the fall of Takato Castle on March 2nd, all remaining Takeda forces in Shinano Province surrendered without resistance. Oda Nobutada's army reached the eastern border of the Takeda homeland, while Tokugawa Iyeyasu infiltrated Kai from Suruga Province with Takeda traitor Anayama Genba as a guide. Meanwhile, Takeda Katsuyori and his 10-15,000 strong army in Shimpu Castle believed Takato would hold for some time, but the castle's swift fall within a day caused widespread panic among Takeda supporters.