It was built on rocky crags, and well-defended; the Minamoto had even built a dam to create a moat. However, a traitor within the fortress tied a message to an arrow, firing it into the Taira camp, and revealing a way to breach the dam and drain the water. The castle soon fell to the Taira, but Yoshinaka and much of his forces survived and escaped.[2][3]
References
^Sansom, George (1958). A History of Japan to 1334. Stanford University Press. p. 293. ISBN0804705232.
^Turnbull, Stephen (1998). The Samurai Sourcebook. Cassell & Co. p. 201. ISBN1854095234.
^Turnbull, Stephen (1977). The Samurai, A Military History. MacMillan Publishing Co., Inc. p. 58. ISBN0026205408.