1520: Hosokawa Takakuni Leaves Kyoto and Yōgaiyama Castle Is Built - Sengoku Shogun Map
Under pressure from Hosokawa Sumimoto's offensive in Settsu, Hosokawa Takakuni withdrew from Kyoto to Ōmi in February. In Kai, Takeda Nobutora began building Yōgaiyama Castle as a mountain stronghold protecting Tsutsujigasaki.
Major events
- 1520-02: Hosokawa Takakuni Leaves Kyoto — After suffering defeat during Hosokawa Sumimoto's offensive in Settsu, Hosokawa Takakuni returned to Kyoto on the seventeenth day of the second month, but withdrew to Sakamoto in Ōmi after his offer to guard the shogun was rejected.
- 1520-月日不詳: Takeda Nobutora Begins Building Yōgaiyama Castle — Takeda Nobutora began building Yōgaiyama Castle as a mountain stronghold protecting Tsutsujigasaki from the north.