This original edited volume draws upon the latest work of a global cast of scholars and practitioners in several fields to examine the history, evolution and lessons of previous expeditionary police advising missions. Since the end of the Cold War, there has been an explosion of efforts to build modern police forces in other lands via dispatching police advisory missions. There is much to be learned from these recent efforts, but there are equally valuable lessons to be gathered by examining the breadth of a practice that, surprisingly to most, dates to the end of the 19th century.