Nagunutsugi Castle Ruins

Overview

Nagunutsugi Castle Ruins is a mountain castle in Minakami-machi, Gunma Prefecture, built by Sanada Masayuki. Constructed in 1579 and abandoned in 1590, its short 10-year lifespan belies its significant historical importance. It's particularly famous for the "Nagunutsugi Castle Incident," which triggered Toyotomi Hideyoshi's Odawara Campaign. The Nagunutsugi Castle Incident occurred just before Hideyoshi attacked the Hojo clan in 1590. In this incident, Inomata Kuniyasu, a vassal of the Hojo clan, usurped Nagunutsugi Castle, betraying the Sanada clan. This event solidified Hideyoshi's resolve to conquer the Hojo clan, leading to the Odawara Campaign. Located near the confluence of the Tone River and the Akaya River, on a plateau approximately 50 meters above sea level, Nagunutsugi Castle Ruins boasts a natural fortress with cliffs on three sides. Designated as a Gunma Prefecture historical site, the ruins are well-preserved, with remnants of the main enclosure, second enclosure, third enclosure, and other structures that evoke the castle's past. A visitor center and parking area are also conveniently located nearby. When visiting Nagunutsugi Castle Ruins, explore the surrounding history and culture. Understanding the strategic maneuvers of Sanada Masayuki and the historical context of Toyotomi Hideyoshi's Odawara Campaign will deepen your appreciation of this fascinating site.