The Siege of Ulsan (Hangul: 울산성 전투, Hanja: 蔚山城戰鬪) was an unsuccessful Korean and Chinese attempt to capture Ulsan Castle from the Japanese late in the Imjin War. The Japanese suffered heavy losses during the siege. In 1597, Japanese decided to attack Korea again, but Japanese force retreated to the southern Gyeongsang province. Without provisions and reinforcements, the Japanese forces had to remain in the coastal fortresses (known as wajō)...