This week Patrick and a panel of military and political historians discuss the origins and legacy of the Mexican-American war. Joining Patrick on the panel are: Dr Daniel Geary, Associate Professor, Department of History, Trinity College Dublin, Dr Peter Guardino, author of 'The Dead March: A History of the Mexican-American War', Dr Donald S. Frazier, Professor of History at Mc Murry University, Texas, Dr Amy S. Greenberg, George Winfree Professor of American History, Penn State University, Dr John C. Pinheiro, author of 'Manifest Ambition: James K Polk and Civil Military Relations during the Mexican War' and Dr Timothy J. Henderson, author of 'A Glorious Defeat: Mexico and It's War with the United States'.