was a samurai commander of the Suganuma clan during Japan's 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...

. Originally serving under the Imagawa clan, until the year of 1560, Sadamitsu then entered the service of the Tokugawa

Tokugawa clan

The was a powerful daimyo family of Japan. They nominally descended from Emperor Seiwa and were a branch of the Minamoto clan by the Nitta clan. However, the early history of this clan remains a mystery.-History:...

. After years of loyal service to Tokugawa Ieyasu

Tokugawa Ieyasu

 was the founder and first shogun of the Tokugawa shogunate of Japan , which ruled from the Battle of Sekigahara  in 1600 until the Meiji Restoration in 1868. Ieyasu seized power in 1600, received appointment as shogun in 1603, abdicated from office in 1605, but...

 in battles such as Anegawa

Battle of Anegawa

The 1570 came as a reaction to Oda Nobunaga's sieges of the castles of Odani and Yokoyama, which belonged to the Azai and Asakura clans. It was also referred to as the Battle of Nomura by the Oda and Azai clans and the Battle of Mitamura by the Asakura clan.As warriors sallied forth from the...

 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...

, in 1601 he was granted a 20,000-koku

Koku

The is a Japanese unit of volume, equal to ten cubic shaku. In this definition, 3.5937 koku equal one cubic metre, i.e. 1 koku is approximately 278.3 litres. The koku was originally defined as a quantity of rice, historically defined as enough rice to feed one person for one year...

 fief in Nagashima

Nagashima

' was a series of fortresses and fortifications controlled by the Ikkō-ikki, a sect of warrior monks in Japan's Sengoku period who opposed samurai rule. It was attacked and destroyed by Oda Nobunaga in the 1570s...

 in Ise province

Ise Province

or was a province of Japan including most of modern Mie Prefecture. Ise bordered Iga, Kii, Mino, Ōmi, Owari, Shima, and Yamato Provinces.The ancient provincial capital was at Suzuka...

.

It is not fully clear whether Sadamitsu is the same person as Suganuma Sadamichi

Suganuma Sadamichi

' was a samurai commander in Japan's Sengoku period. He fought in the 1570 battle of Anegawa, and at the 1573 siege of Noda, in which he attempted to defend Noda castle against Takeda Shingen....

who lived around the same time.