Book excerpt: The Battle of Antietam took place on September 17, 1862, and still stands as the bloodiest single day in American military history. Additionally, in its aftermath, President Abraham Lincoln issued his famous Emancipation Proclamation. In this engaging, easy-to-use guide, Carol Reardon and Tom Vossler allow visitors to understand this crucial Civil War battle in fine detail. Abundantly illustrated with maps and historical and modern photographs, A Field Guide to Antietam explores twenty-one sites on and near the battlefield where significant action occurred. Combining crisp narrative and rich historical context, each stop in the book is structured around the following questions: *What happened here? *Who fought here? *Who commanded here? *Who fell here? *Who lived here? *How did participants remember the events? With accessible presentation and fresh interpretations of primary and secondary evidence, this is an absolutely essential guide to Antietam and its lasting legacy.