Editors. "The Battle of Gettysburg". The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=10948, accessed 22 May 2013.]
The largest battle in the western hemisphere. Confederate forces suffered 30,000 casualties; Union troops, 25,000. On July 5, Lee's army retreated across the Potomac River, and was unable to take the offensive again.