The Gettysburg Address On July 1, 1863 one of the most important Civil War battles began that lasted for a period of three days which occurred in Gettysburg, Pennsylvania. The vicious war involved the confederate army of Northern Virginia ordered by General Robert E. Lee and the federal army of Potomac ordered by General George G. Meade. Months prior to the Gettysburg War, Commander Lee and his confederate army defeated the Potomac army in Chancellorsville, Virginia, however, Commander Lee decided