Hiuchiyama (火打ち山) was one of Minamoto no Yoshinaka's fortresses in Echizen Province, Japan. In April and May of 1183, a Taira force led by Taira no Koremori attacked the fortress. 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.
References
Sansom, George (1958). 'A History of Japan to 1334'. Stanford, California: Stanford University Press.
Turnbull, Stephen (1998). 'The Samurai Sourcebook'. London: Cassell & Co.
