was a retainer beneath the clan of Imagawa

Imagawa clan

The was a Japanese clan that claimed descent from Emperor Seiwa . It was a branch of the Minamoto clan by the Ashikaga clan.-Origins:Ashikaga Kuniuji, grandson of Ashikaga Yoshiuji, established himself in the 13th century at Imagawa and took its name.Imagawa Norikuni received from his cousin the...

 throughout the latter Sengoku Period

Sengoku period

The or Warring States period in Japanese history was a time of social upheaval, political intrigue, and nearly constant military conflict that lasted roughly from the middle of the 15th century to the beginning of the 17th century. The name "Sengoku" was adopted by Japanese historians in reference...

 of Feudal Japan. In the year of 1554 Takeda Shingen

Takeda Shingen

, of Kai Province, was a preeminent daimyo in feudal Japan with exceptional military prestige in the late stage of the Sengoku period.-Name:Shingen was called "Tarō" or "Katsuchiyo" during his childhood...

 initiated a campaign into Shinano province

Shinano Province

or is an old province of Japan that is now present day Nagano Prefecture.Shinano bordered on Echigo, Etchū, Hida, Kai, Kōzuke, Mikawa, Mino, Musashi, Suruga, and Tōtōmi Provinces...

, and as the Imagawa and the Takeda both shared a mutual friendship with one another at that present time, Munekore and other supporters of the Imagawa would be dispatched in support to the latter. By the year of 1560 Munekore would unfortunately lose his life at the Battle of Okehazama

Battle of Okehazama

The took place in June 1560. In this battle, Oda Nobunaga defeated Imagawa Yoshimoto and established himself as one of the front-running warlords in the Sengoku period.-Background:...

-- a critical conflict that would have nonetheless borne him a similar detriment even if having survived it.