When the Japanese army landed in Korea in 1592 the Korean defenders were woefully underprepared. Confused diplomacy and divisive court politics had hampered Korean preparations for the coming Japanese attack. The only Korean commander who came out looking good was the war hero Admiral Yi Sunsin....

In 1592 the Japanese launched a massive invasion of the Korean Peninsula. The Japanese leader Toyotomi Hideyoshi believed that Korea would submit without much of a fight and that his army would very quickly move on to the real target, the capital of Ming China. Six years later the Japanese were...