"This impressive study, based on a random sample of forty thousand Civil War soldiers both black and white, reaches important conclusions about their motivation and behavior. Its most significant findings emphasize the role of close social networks within companies and regiments in promoting combat performance, preventing desertion, and increasing survival rates in POW camps. Readable and accessible to nonspecialists, this book should find a wide audience among those interested in the Civil War as well as group behavior more generally."--James McPherson, author of the Pulitzer Prize-winning "Battle Cry of Freedom"

"This remarkable book is destined to become a classic in social science. It addresses issues of supreme importance and timeliness--loyalty, betrayal, heroism, cowardice, survival, the challenges of diversity, and the benefits of social bonds. It rests on rigorous statistical analysis of an extraordinary historical archive, and yet it is so readable as to be unputdownable. It deals with a single epochal event in one nation's history--the U.S. Civil War--and yet its lessons are highly relevant in many other eras and societies, including our own."--Robert Putnam, author of "Bowling Alone: The Collapse and Revival of American Community"

"Dora Costa and Matthew Kahn built a social science laboratory from the enlistment and pension records of men who fought in the Union Army during the American Civil War. In that remarkable laboratory they have discovered how friendship, community ties, and social status alter our choices. Read "Heroes and Cowards" for its reliable science; savor it for how it honors the harrowing circumstances that made the science possible."--Michael Hout, coauthor of "Century of Difference: How America Changed in the Last One Hundred Years"

"Dora Costa and Matthew Kahn have written a superb book on bravery in the Civil War. Their work informs us not only about courage under fire, but about the many settings where people are called upon to act for a common good. This is a pioneering piece of social science."--Edward L. Glaeser, Harvard University

"In the remarkable "Heroes and Cowards," Costa and Kahn demonstrate how social bonds helped determine which soldiers would fight to the death and which would flee for their lives, which soldiers would survive the deadly prison camps and which would succumb. The authors utilize the tools of social science to serve, rather than obscure, the riveting accounts by Union soldiers--the heroes, the cowards, and those in between."--Claude S. Fischer, University of California, Berkeley

"With its excellent blending of qualitative and quantitative data, this is a significant contribution to Civil War history and, more generally, to military history. It will be of great interest to economists, historians and general readers, especially the large number still fascinated by the Civil War."--Stanley L. Engerman, coauthor of "Time on the Cross"

"Dora Costa and Matthew Kahn are two accomplished scholars whose work offers substantially new insights, on why men desert and how this affects them; on the experience of black soldiers during and after the war; and on the migration patterns of war veterans. The research behind this book is based on data that has not previously been used by scholars, and their use of that data is imaginative and revealing. "Heroes and Cowards" is a significant contribution to ourknowledge of how Civil War veterans coped with the stresses of war and their lives after 1865."--Roger Ransom, author of "The Confederate States of America: What Might Have Been"

""Heroes and Cowards" is a remarkable and impressive piece of economic history, a unique book that will interest a large readership."--Louis P. Cain, Loyola University Chicago