of the battle that morning and left Lee unsure about enemy dispositions through most of July 2. On the Union side, Meade arrived after midnight. The II Corps and III Corps took up positions on Cemetery Ridge, and the XII Corps and the V Corps were nearby to the east. Only the VI Corps was a significant distance from the battlefield, marching rapidly to join the Army of the Potomac. The first day at Gettysburg—more significant than simply a prelude to the bloody second and third days—ranks as the 23rd-largest battle of the war by number of troops engaged. About one quarter of Meade's army (22,000 men) and one third of Lee's army (27,000) were engaged. Union casualties were almost 9,000; Confederate slightly over 6,000. Notes References Sources Adkin, Mark. The Gettysburg Companion: The Complete Guide to America's Most Famous Battle. Mechanicsburg, PA: Stackpole Books, 2008. . Bearss, Edwin C. Fields of Honor: Pivotal Battles of the Civil War. Washington, DC: National Geographic Society, 2006. . Busey, John W., and David G. Martin. Regimental Strengths and Losses at Gettysburg. 4th ed. Hightstown, NJ: Longstreet House, 2005. . Coddington, Edwin B. The Gettysburg Campaign; a study in command. New York: Scribner's, 1968. . Eicher, David J. The Longest Night: A Military History of the Civil War. New York: Simon & Schuster, 2001. . Gottfried, Bradley M. Brigades of Gettysburg. New York: Da Capo Press, 2002. . Longacre, Edward G. The Cavalry at Gettysburg: A Tactical Study of Mounted Operations during the Civil War's Pivotal Campaign, 9 June–14 July, 1863. Lincoln: University of Nebraska Press, 1986. . Longacre, Edward G. General John Buford: A Military Biography. Conshohocken, PA: Combined Publishing, 1995. . Mackowski, Chris, and Kristopher D. White. "Second Guessing Dick Ewell: Why Didn't the Confederate General Take Cemetery Hill on July 1, 1863?" Civil War Times, August 2010. Martin, David G. Gettysburg July 1. rev. ed. Conshohocken, PA: Combined Publishing, 1996. . Petruzzi, J. David, and Steven Stanley. The Complete Gettysburg Guide. New York: Savas Beatie, 2009. . Pfanz, Harry W. The Battle of Gettysburg. National Park Service Civil War series. Fort Washington, PA: U.S. National Park Service and Eastern National, 1994. . Pfanz, Harry W. Gettysburg – The First Day. Chapel Hill: University of North Carolina Press, 2001. . Sears, Stephen W. Gettysburg. Boston: Houghton Mifflin, 2003. . Trudeau, Noah Andre. Gettysburg: A Testing of Courage. New York: HarperCollins, 2002.