KEYNOTE: ? A full-length study and fresh interpretation of The Battle of South Mountain, the first conclusive victory for the Army of the Potomac Many readers of Civil War history have been led to believe that the battle of South Mountain (September 14, 1862) was but a trifling skirmish, a preliminary engagement of little strategic or tactical consequence overshadowed by Antietam's horrific carnage just three days later. In fact, the fight was a decisive Federal victory and important turning point in the campaign, as historian Brian Matthew Jordan convincingly argues in his fresh interpretation Unholy Sabbath: The Battle of South Mountain in History and Memory, September 14, 1862. Most authors of the Maryland Campaign brush past South Mountain in a few paragraphs or a single chapter. Jordan, however, presents a full-length study based upon extensive archival research, newspaper accounts, regimental histories, official records, postwar reunion materials, public addresses, letters, and diaries. Readers will come away with a full understanding of the strategic results of the fighting in general, and a keen appreciation of the tactical actions at Fox, Turner, and Crampton's gaps in particular. The Northern victory provided a substantial boost for the downtrodden men of the Union army who recognized the battle for what it was: a sharp, hours-long combat that included hand-to-hand combat and resulted in nearly 5,000 casualties. Indeed, South Mountain was the first conclusive victory for the Army of the Potomac?the first time the men of that army maintained possession of the field and with it the responsibility of burying the dead. Jordan goes well beyond the military aspects of the battle to better understand and explain how and why South Mountain faded from public memory. He chronicles how and why former Confederates, true to the Lost Cause, insisted they were outnumbered while proud Union veterans remembered South Mountain as a full-scale engagement?wholly distinct from Antietam?where they outfought and defeated their Rebel opponents. About the Author: Brian Matthew Jordan graduated in 2009 with a Bachelor of Arts in History and Civil War Era Studies from Gettysburg College. The native of northeastern Ohio discovered a passion for history at an early age. He is a frequent speaker at Civil War Round Tables nationwide, delivers popular tours for Gettysburg College's Civil War Institute and the Gilder Lehrman Institute of American History, and conducts seminars for various Teaching American History grant recipients. His published work has appeared in multiple journals including Civil War History. Jordan is currently working on a Ph.D. in History at Yale University. ILLUSTRATIONS: 14 maps *