You can see how the castle was developed at the site.
Features
Older part of Castle
Today, the ruins of Minowa Castle have been well developed for visitors. If you have a car, you can park at some parking lots for the visitors beside the ruins. The main parking lot is the eastern foot of the hill where the castle was located. You can walk up from the parking lot to the ruins on a gentle winding slope which was actually the Back Route. You will first reach the Second Enclosure, part of the main portion of the castle.
The map around the castle
The Back RouteGoing to the Second Enclosure
The main portion consists of the Second, Main and Gozen Enclosures from south to north. These enclosures are basically surrounded by thick earthen walls and divided by deep dry moats, which are the oldest part of the castle. If you walk into the Main Enclosure where the hall of the lord was built, you can now see the recently restored wooden bridge connecting to the western part of the castle.
The Main EnclosureThe stone monument of the castle in the Main EnclosureThe wooden bridge connecting to the western part of the castleThe earthen walls of the Main Enclosure and the dry moat beside it
If you go further, you will reach the Gozen Enclosure, the last part of the Nagano Clan. There is the well in the enclosure, which was discovered in 1927, where many memorial tablets of the clan were found from the bottom. That meant the episode when the clan had been defeated may have been confirmed.
The Gozen EnclosureThe well where many memorial tablets of the clan were found
Vast Dry Moat
You can walk down the steep trail on the northern edge of the Gozen Enclosure to the bottom of the dry moat. If you turn right to the east, you will reach the Inari Enclosure that Naomasa Ii built. This enclosure had a water moat on the side in the past.
Walking down from the Gozen Enclosure to the bottom of the dry moatThe bottom of the dry moat beside the Gozen EnclosureThe Inari Enclosure and the former water moat beside it
If you turn left to the west, you can walk around the bottom and see how large and deep the moat is. You can also see the older stone walls surrounding the Gozen Enclosure, which the Nagano Clan might have built. If you go further to the south, you will arrive at the Second Enclosure.
The vast bottom of the dry moatThe remaining stone walls under the Gozen EnclosureGoing back to the Second Enclosure through under the wooden bridge
Umadashi System is developed later
The Second Enclosure was the pivot of offence and defense, where the three main routes to the castle are all together. Other than the Back Route from the east, the Main Route comes from the west and the other route comes from the south. In particular, a great artificial trench called O-Horikiri is dug in the southern side of the enclosure to prevent enemies’ attacks.
The great artificial trenchThe bottom of the trenchThe stone walls under the earthen bridge over the trench
Only the narrow earthen bridge is over the trench, connecting to the southern route. Moreover, a square stronghold called Kaku-Umadashi is sticking out of the Second Enclosure through the bridge. The Umadasi system is a unique defense system which the Takeda and Tokugawa Clans often used. This system in Minowa Castle was probably developed by Takeda and completed by Naomasa under Tokugawa. The two-story turret gate called Kaku-umadashi Western Entrance Gate was recently restored based on the achievement of the excavation, which had been the symbol of the castle.
The earthen walls over the trenchThe square stronghold called Kaku-UmadashiThe restored turret gateThe Kaku-Umadashi seen from the south
The castle of Narimasa Nagano, the strongest general
Location and History
Nagano Clan builds Castle in Sengoku Period
Minowa Castle was located on a hill at the foot of Mt, Haruna in Kozuke Province which is now Gunma Prefecture. The Nagano Clan first built this castle at the start of the 16th Century during the Sengoku Period. The clan was thought to originally be an official family of the local government in the ancient times, and eventually became a powerful local lord in the Middle Ages. They had lived near the Provincial Office on a plain land in the center of the province. However, it got dangerous to continue to do so, because many battles happened all over the Kanto Region since the late 15th Century. That’s why the clan built the castle beside the mountain area near western part of the province.
The location of the castle
Narimasa Nagano fights alone
The Nagano Clan worked under the Uesugi Clan, the governor of Kozuke Province. Norimasa Uesugi, the lord of the clan at that time, was defeated by the Hojo Clan from the south in the Battle of Kawagoe Castle in 1546. After that, he escaped from Kozuke Province to Echigo Provence in the north of the Kozuke Province. As a result, most of the local lords supported the Hojo Clan. However, Narimasa Nagano who was the lord of the clan, didn’t do so, showing his loyalty to the Uesugi Clan. He was considered as one of the strongest generals at that time, against large warlords such as the Hojo and Takeda Clans. He organized a group of local lords in the region, called the Minowa Group, to maintain their territories. He even accommodated some other generals who lost their territories due to defeats of battles, such as Yukitaka Sanada.
The wooden statue of Narimasa Nagano, owned by Chojunji Temple, quoted from the website of Takasaki CityThe portrait of Yukitaka Sanada, owned by Chokokuji Temple (licensed under Public Domain via Wikimedia Commons)
After some years of his binding time, Kenshin Uesugi, the successor of Norimasa, invaded the Kanto Region including Kozuke Province from Echigo Province in 1560. Narimasa became one of senior vassals of the Uesugi Clan again and succeeded to be the lord of the western Kozuke Province. However, when Kenshin returned to his home base, Kasugayama Castle in Echigo Province, the Hojo Clan started to get the territories back. In addition, Narimasa tried to subject the Obata Clan in Kunimine Castle to the southwest of Narimasa’s territory, but failed. This was because Nobuzane Obata, the lord of the clan, asked Shingen Takeda, one of the greatest warlords, for help and became his retainer. Yukitaka Sanada, who was saved by Narimasa, also became a senior vassal of Shingen after leaving Narimasa. Shingen was a lifetime competitor of Kenshin, so he started to invade the western Kozuke in 1561.
The portrait of Kenshin Uesugi, owned by the Uesugi Shrine (licensed under Public Domain via Wikimedia Commons)The imaginary drawing of Kunimine Castle, exhibited by Kanra Town Museum of History and FolkloreNorizane Obata drawn in the “Battle of Nagashino” folding screens, exhibited by Kanra Town Museum of History and FolkloreThe portrait of Shingen Takeda, owned by Jimyo-in Temple (licensed under Public Domain via Wikimedia Commons)
Castle falls with Destruction of Nagano Clan
Narimasa could somehow maintain Minowa Castle and the area around in his life, but died of illness in 1561. His son, Narimori Nagano followed his father’s way not to surrendering to their enemies. However, Shingen did a full-scale attack on Minowa Castle in 1566 before the castle fell. Narimori and his relatives fought to the end and finally killed themselves in the Gozen Enclosure of the castle. It is said that they threw the memorial tablets of their ancestors into the well in the enclosure before their deaths.
The family crest of the Nagano Clan, called Hiogi or A fan made of woodThe ruins of well in the Gozen Enclosure of Minowa Castle
After that, Nobuzane Obata changed their master to the Oda and Hojo Clans to maintain their territory after the destruction of the Takeda Clan. In 1590, when the ruler, Hideyoshi Toyotomi invaded Hojo’s Kanto Region, Obata’s own castle fell, then the clan loss their territory as well. On the other hand, the Sanada Clan struggled to be independently based in Ueda, Numata and Iwabitsu Castles. They finally succeeded to achieve this, however it was very hard to climb.
Ueda CastleThe ruins of Numata CastleThe miniature model of Iwabitsu Castle at the information center at the site
Naomasa Ii modernizes and abandons Castle
After Minowa Castle fell, the Takeda Clan owned the castle, followed by the Oda, Hojo and Tokugawa Clans. Naomasa Ii, the head of senior vassals of the Tokugawa Clan, was the last lord of the caste. He entered the castle when the Tokugawa Clan was moved to the Kanto Region in 1590. Minowa Castle was large, but originally had enclosures mainly made of soil, surrounded by dry moats. Naomasa improved and modernized the castle as much as he could. For example, he developed new enclosures such as the Inari Enclosure with a water moat to be more defensive. Stone walls were built alongside the Main Route to show the castle lord’s authority. Some turret gates were also built in the important positions of the castle, such as the Kaku-umadashi Western Entrance Gate. However, Naomasa finally moved to his new home base called Takasaki Castle on a plain land in 1598 before Minowa Castle was abandoned.
The portrait of Naomasa Ii, owned by Hikone Castle Museum (licensed under Public Domain via Wikimedia Commons)The Inari EnclosureThe restored Kaku-umadashi Western Entrance GateThe stone walls of the Third Enclosure Gate Ruins
