In the "Azuma kagami" (Mirror of the East), the official (or semi-official) diary of the Kamakura Shogunate, the battle of Dannoura, listed under the entry of 24th day of the third month of Genryaku 2, is described as follows: 'The ships of the Minamoto and Taira, their forces apart from each other by approximately 300 meters, met in battle on the sea of Dannoura in Akamaseki of Nagato Province.
鎌倉幕府の公式日記（もしくはそれに准じるもの）である『吾妻鏡』には壇ノ浦の戦いについては元暦二年三月二十四日の条で「長門国赤間関壇ノ浦の海上で三町を隔て船を向かわせて源平が相戦う。