The North Korean invasion of the Republic of Korea (ROK) in June 1950 prompted an enormous international response, as first the United States and then a host of allied countries contributed combat troops or medical personnel to the United Nations effort to support the South Koreans. In this book, Benjamin Lai examines the ROK ground forces and their UN allies, briefly describing each contingent's organization, appearance, and service record in the Korean War. His incisive commentary is complemented by specially chosen photographs and specially commissioned full-color artwork depicting the various national contingents involved.