was a Japanese samurai general in the Takeda

Takeda family

The ' was a famous clan of daimyō in Japan's late Heian Period to Sengoku period.The Takeda were descendants of Emperor Seiwa and are a branch of the Minamoto clan , by Minamoto no Yoshimitsu , brother to the Chinjufu-shogun Minamoto no Yoshiie...

 army under 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...

, and later under Takeda Katsuyori

Takeda Katsuyori

was a Japanese daimyo of the Sengoku Period, who was famed as the head of the Takeda clan and the successor to the legendary warlord Takeda Shingen. He was the son of Shingen by the , the daughter of Suwa Yorishige...

. He was considered one of the "Twenty-Four Generals of Takeda Shingen

Twenty-Four Generals of Takeda Shingen

The Twenty-Four Generals were just one of many historically famous groupings of battle commanders from Japan's Sengoku Period. These Twenty-Four were the most trusted commanders of the armies of Takeda Shingen...

", the clan's greatest commanders. He was also lord of Iwadono Castle, and fought under the Takeda at the battles of Kawanakajima

Battles of Kawanakajima

The ' were fought in the Sengoku Period of Japan between Takeda Shingen of Kai Province and Uesugi Kenshin of Echigo Province in the plain of Kawanakajima, in the north of Shinano Province. The location is in the southern part of the present-day city of Nagano.The five major battles took place in...

, Mikatagahara

Battle of Mikatagahara

The ' was one of the most famous battles of Takeda Shingen's campaigns, and one of the best demonstrations of his cavalry-based tactics.-Background:...

, and Nagashino

Battle of Nagashino

The ' took place in 1575 near Nagashino Castle on the plain of Shitaragahara in the Mikawa province of Japan. Forces under Takeda Katsuyori had besieged the castle since the 17th of June; Okudaira Sadamasa , a Tokugawa vassal, commanded the defending force...

 and Temmukuzan

Battle of Temmokuzan

The 1582 in Japan, also known as the Battle of Toriibata, is regarded as the last stand of the Takeda family. This was the final attempt by Takeda Katsuyori to resist the combined forces of Tokugawa Ieyasu and Oda Nobunaga, who had been campaigning against him for some time.In his bid to hide from...

.

Oyamada betrayed the Takeda clan in 1582; however, when he went to the Oda clan

Oda clan

The was a family of Japanese daimyo who were to become an important political force in the unification of Japan in the mid-16th century. Though they had the climax of their fame under Oda Nobunaga and fell from the spotlight soon after, several branches of the family would continue on as daimyo...

 camp, he was executed by Oda Nobunaga

Oda Nobunaga

was the initiator of the unification of Japan under the shogunate in the late 16th century, which ruled Japan until the Meiji Restoration in 1868. He was also a major daimyo during the Sengoku period of Japanese history. His opus was continued, completed and finalized by his successors Toyotomi...

's officer Horio Yoshiharu

Horio Yoshiharu

Horio Yoshiharu was a daimyo in Azuchi-Momoyama period and Edo period.He was appointed to one of three chu-rō by Toyotomi Hideyoshi and the first leader of the Matsue clan.He was also known as Horio Mosuke ....

.