was a series of fortresses and fortifications controlled by the Ikkō-ikki, a sect of warrior monks in Japan's Sengoku period who opposed samurai rule. It was attacked and destroyed by Oda Nobunaga in the 1570s. This, combined with the destruction of the Ikki's other main fortress, the Ishiyama Hongan-ji, several years later, ended the threat the Ikko-ikki posed to Nobunaga and other samurai conquerors. The fortress was situated on a swampy delta, on the border of Owari and Ise Provinces,… (More on Nagashima)