Iwabitsu Castle : A Study of Japanese Bibliography

This is all about Iwabitsu Castle Ruins you want to know.
Every information you get on this site will be from a credible source based on Japanese history (books for reference).

Iwabitsu Castle aerial view Looking down from the northeastern sky from Continued Top 100 Japanese Castle Official Guidebook.

Kuruwa is developed on the northeastern ridge of Mt. Iwabitsu, with Ninomaru in the center, Honmaru on the top, and Nakajō on the left.

Profile : Iwabitsu Castle Ruins

LocationAgatsuma District, Gunma Prefecture
Also known asNo common name
Type of castleMountaintop
Mountain's nameMt. Iwabitsu
DesignationAgatsuma-chō Historical Sites
Year builtUnknown
Castle lordUnknown
Refurbishment lordSanada Clan
Portrait of Sanada Yukitaka from Wikipedia
Portrait of Sanada Masayuki from Wikipedia
Family Crest from "Bukan Complete Works" (produced by CODH)
adapted from "Classical Japanese National Data Set" (Kokubunken Collection)

The family crest was originally created from the pattern that the emperor and the royal family put on the kimono, and the pattern was made into a fixed pattern, and the one attached to his own oxcart is said to be the beginning of the family crest. The warlords drew large crests on the flag-fingers, used to distinguish enemy views on the battlefield, and used by the generals to determine which warlords were active and how much.

Iwabitsu Castle admission

admission fee : free
admission time : free   
closing period : reference official site ※Sufficient preparation is required due to the rugged location refrain from climbing from December 1st to March 31st

Iwabitsu Castle Google Map

Iwabitsu Castle Images 

A mountain castle where Sanada Yukimura is said to have spent his childhood.

It has played an important role as an intermediate base on the Sanada road that connects Ueda Castle and Numata Castle. It is unknown who built the castle and when it was built, but it is said that Saitō Clan became the lord of the castle from 1521-28 and ruled the entire Agatsuma District. Takeda Shingen, who invaded there, ordered Sanada Yukitaka to attack Iwabitsu Castle in 1563, but failed twice due to the extremely steep terrain and the reinforcements sent by Uesugi Kenshin. Yukitaka devised a plan and caused him to fall in 1565 due to his strong strategy and surprise attack.
It was a natural hazard surrounded by Mt.Iwabitsu in the southwest, a steep slope down to the Agatsuma River in the south, and rocky mountains in the north. From the west to the east of the ridge, there is a long and narrow main enclosure, a small Ninomaru, and Nakagusuku. A little away Demaru, called Tengu Maru, was located in the northeast, and Yanagisawa Castle, a branch castle, was located further northeast.
Between each Kuruwa, vertical moats and horizontal moats were laid out like a spider's web.
The main building of Yamashiro is generally on the summit, but Iwabitsu Castle is on the hillside.

Even in the Warring States period, inferior to the Oda army's offensive Takeda Katsuyori wants to abandon his hometown of Shinpu Castle and head for Iwabitsu Castle, which is recommended by Sanada Masayuki, the son of Sanada Yukitaka. However, due to the suggestions of Oyamada Nobushige and the eruption of Mt. Asama, Katsuyori changed his policy and headed for Oyamada's castle, Iwadono Castle. However, at the last minute, Oyamada betrayed, and based on this,Takeda Clan followed the path of destruction.
As a vassal to serve from his father "Sanada Yukitaka", "Sanada Masayuki" intended to protect his master "Takeda Katsuyori " from Oda Nobunaga until the end. It is said that if Katsuyori and Masayuki stayed in "Iwabitsu Castle" for a few years, taking advantage of the terrain of the cliffs, the Sengoku history after that would have changed significantly.

Link : A castle closely related to Sanada Clan

【west japan】Ōsaka Castle 【central japan】Ueda Castle 【central japan】Matsushiro Castle 【east japan】Hachiouji Castle 【east japan】Numata Castle 【east japan】Iwabitsu Castle


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