Timeline of 1561
(Eiroku 4; 永禄四年)
- 1561/6 Uesugi Kenshin besieges Hôjô Ujiyasu in Odawara but retreats after two months.
- 1561/6 Saitô Yoshitatsu dies of leprosy and is succeded by Tatsuoki. Only three days later the Saitô are defeated at the Battle of Moribe by Oda Nobunaga.
- 1561/10 Takeda Shingen and Uesugi Kenshin fight the inconclusive 4th Battle of Kawanakajima, the greatest of their contests.
- 1561/11 Môri Motonari and Ôtomo Sôrin battle for Môji Castle in Buzen province.
- 1561/11 The Satomi navy operates against the Hôjô off Muira (Sagami Province).
- 1561/12 Uesugi Kenshin clashes with Hôjô forces at Matsuyama Castle in Musashi province.