As East Asia regains its historical position as a world centre, information on the history of regional relations becomes ever more critical. Astonishingly, Northeast Asia enjoyed five centuries of international peace from 1400 to 1894, broken only by one major international war - the invasion of Korea in the 1590s by Japan's ruler Hideyoshi. This war involved Koreans, Japanese, Chinese, Southeast Asians, and Europeans; it saw the largest overseas landing in world history up to that time and devastated Korea. It also highlighted the nature of the strategic balance in the region, presenting...