Forming an alliance with the Asai Family to weaken the Saito family and Oda Nobuaki, who were allied together, was not the only diplomatic move Oda Nobunaga made.
While colluding with Asai Nagamasa, Oda Nobunaga was also actively sending people into the mountains of eastern Minoh to try to persuade the Tooyama Family to join him—the Tooyama Family were natives of eastern Minoh and held considerable influence locally; back in the Tiger of Owari era, the Family Head had married Oda Nobuhide's half-sister, making him a sort of cheap uncle to Oda Nobunaga.
Besides that, Oda Nobunaga was worried that Takeda Shingen might interfere when he was dealing with Oda Nobuaki and Saito Ryuko, so he also actively dispatched envoys to Kai, hoping to become allies by marriage with the Takeda family. He even had someone ready for the marriage—he took a daughter from one of his half-sisters, adopted her as his own daughter, and planned to marry her into the Takeda family.
