In and around strategically important Chattanooga, Tenn., in the autumn of 1863, there occurred some of the most complex maneuvers and hard fighting of the Civil War. The Confederate victory at Chickamauga (September 19-20) gave new hope to the South after the defeats at Gettysburg and Vicksburg in July of that year. At Chattanooga (November 23-25) Union forces under Maj. Gen. Ulysses S. Grant blasted this hope and prepared the way for the capture of Atlanta and Sherman’s “March to the Sea.” Chickamauga and Chattanooga National Military Park, oldest and largest of the national military parks, commemorates the heroic soldiers of both North and South in the battles for the control of Chattanooga. The year 1863 proved to be one of victory for the Union forces. Three great campaigns took place which shaped the destiny of the war. The first, a decisive blow at Gettysburg, forced a Confederate army under Gen. Robert E. Lee to abandon its attempt to invade Northern soil. Lee began an orderly retreat to Virginia on July 4. On the same day, but far removed from the fields of Gettysburg, Lt. Gen. John C. Pemberton surrendered his army and the City of Vicksburg, Miss., to General Grant. The fall of Vicksburg, simultaneous with the victory at Gettysburg, gave heart and strength to the North, while Confederate morale dropped. The third campaign, Murfreesboro to Chattanooga, slow and uncertain in its first phases, and including later the great Confederate victory at Chickamauga, culminated nearly 5 months after the other two in ultimate victory for the North in the Battle of Chattanooga. _Wartime Importance of Chattanooga and East Tennessee_ Chattanooga had only 2,545 inhabitants in 1860, but its importance was out of all proportion to its size. Situated where the Tennessee River passes through the Cumberland Mountains, forming gaps, it was called the “Key to East Tennessee” and “Gateway to the deep South.” The possession of Chattanooga was vital to the Confederacy, and a coveted goal of the Northern armies. Chattanooga’s principal importance during the Civil War was its position as a railroad center. Four lines radiated in the four principal directions—to the North and Middle West via Nashville, to the western States via Memphis, to the South and southern seaboard via Atlanta, and to Richmond and the North Atlantic States via Knoxville.