Original sentence: A war report submitted by Admiral Yi on 14 June 1592 refers to "iron spikes" protruding from the roof:.One Japanese record of 'Ship-Battles in Korea' includes a description of a battle as experienced by two Japanese commanders on 9 July, 1592, three weeks after Yi Sun-sin's having described the features of his turtle boats:.The first image of a turtle ship is found in the Complete Writings of Admiral Yi which were edited in 1795.Yi Pun, nephew of the admiral and witness of the war, mentions in his biographical record that the upper part (roofdeck) was covered with planks studded with bladed spikes
Edited sentence: One Japanese record of 'Ship-Battles in Korea' includes a description of a battle as experienced by two Japanese commanders on 9 July, 1592, three weeks after Yi Sun-sin's having described the features of his turtle boats.Primary Korean sources are generally silent on the matter:.The relevant part reads:.There are no known contemporary depictions, so that the first image of a turtle ship - and the one commonly referred to - is found in the Complete Writings of Admiral Yi which were edited for the first time two hundred years after the war in 1795.Yi Pun, nephew of the admiral and witness of the war, mentions briefly in his biographical record that the upper part (roofdeck) was covered with planks studded with bladed spikes, but gives no further details concerning the materials used.Yi himself makes no mention of an iron-clad roof in his comprehensive war diary, although in a war report submitted on 14 June 1592, he refers once to "iron spikes" protruding from the roof: