The 1571 siege of Fukazawa was one of a number of battles which formed 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...

's campaigns against the Hōjō clan

Late Hojo clan

The ' was one of the most powerful warrior clans in Japan in the Sengoku period and held domains primarily in the Kantō region.The clan is traditionally reckoned to be started by Ise Shinkurō, who came from a branch of the prestigious Ise clan, a family in the direct employment of the Ashikaga...

, 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...

. Having burned the town of Odawara

Odawara, Kanagawa

is a city located in western Kanagawa Prefecture, Japan. As of 2010, the city had an estimated population of 198,466 with a population density of 1,740 persons per km² . The total area was .-Geography:...

 surrounding the Hōjō home castle

Odawara Castle

is a landmark in the city of Odawara in Kanagawa Prefecture, Japan.-History:Odawara was a stronghold of the Doi clan during the Kamakura period, and a fortified residence was built by their collateral branch, the Kobayakawa clan stood on the approximate site of the present castle...

 two years earlier

Siege of Odawara (1569)

The first siege of Odawara took place in 1569. After failing to take Hachigata and Takiyama castles, Takeda Shingen nevertheless moved against the Hōjō clan capital fortress of Odawara. The siege lasted only three days, after which the Takeda forces burned the town to the ground and left. Odawara...

, he laid siege to a number of other Hōjō holdings in the surrounding provinces, including Fukazawa, in Suruga province

Suruga Province

was an old province in the area that is today the central part of Shizuoka prefecture. It was sometimes called . Suruga bordered on Izu, Kai, Sagami, Shinano, and Tōtōmi provinces; and had access to the Pacific Ocean through Suruga Bay.-History:...

.

This was the sixth time he had invaded Suruga; Fukazawa was held by Hōjō Tsunanari

Hojo Tsunanari

was a samurai commander of the Hōjō clan during Japan's Sengoku period. The adopted brother of Hōjō Ujiyasu, he commanded the defense of Kawagoe castle against siege in 1545....

, who ultimately surrendered just after the lunar New Year, and withdrew to Odawara.