First Siege of Gassan-Toda
- Ouchi Yoshitaka / Mori Motonari (30,000) vs. Amako Haruhisa (15,000)
Hoping to capitalize on the recent death of Amako Tsunehisa and Haruhisa's defeat at Koriyama in 1540, Ouchi Yoshitaka launched an attack into Izumo. The allied progress into Izumo proved exceedingly slow, and at the gates of Gassan-Toda the Ouchi / Mori effort faltered and fell back in disarray. Motonari himself came very close to being captured in the retreat and this reverse is said to have brought about a decided change in Yoshitaka, who afterwards displayed little interest in military endeavors.