[1] Nagahama Castle is located on a small hill with an elevation of 30 meters on Suruga Bay south of downtown Numazu.

and consists of terraces built along the contour of the hill, protected by clay walls and dry moats.

In the 1570s, the Takeda reached an agreement with the Satomi, which allowed them to shift their fleet to Suruga Province, and constructed Nagahama Castle, on the border of Izu and Suruga as a base of operations.

Hideyoshi's forces included the Kuki clan based in Shima Province and the Murakami clan based in the Seto Inland Sea, the two strongest naval powers in Sengoku Japan.

During the 1590 Siege of Odawara, the Hōjō navy faced overwhelming odds and surrendered at Nagahama Castle and at Shimoda.