In the 20th century, there was praise as well as criticism in all kinds of books about him. The criticism was mainly from William Tyler’s - an English sailor on Dingyuan - memoir. But there were also widely accepted ideas that there was a personal enmity between William Tyler and Liu Buchan and that William Tyler’s words were unreliable. But there were two opinions that were really accepted. First, Liu Buchan lacked adequate experience before he was appointed as the captain of Dingyuan and training and command were very bad under him. Second, he was addicted to taking opium all the time, which was universal among his troops.[1]