to sturdier structure and thus were employed in a distance engagement by cannon tactics rather than the grappling tactics of the atakebune-based Japanese navy. "Atakemaru" (安宅丸), the big atakebune made by Mukai Shōgen Tadakatsu for Tokugawa Hidetada and Tokugawa Iemitsu was fully covered by copper plates. See also Ohama Kagetaka, a pirate who used an atakebune Turtle Ship, a Korean ship with similar armor plating Djong, large ship with thick hull, which lower the effectiveness of artillery References Naval ships of Japan 16th-century ships