Q:Information: - The Battle of Gettysburg (with an sound) was fought July 13, 1863, in and around the town of Gettysburg, Pennsylvania, by Union and Confederate forces during the American Civil War. The battle involved the largest number of casualties of the entire war and is often described as the war's turning point. Union Maj. Gen. George Meade's Army of the Potomac defeated attacks by Confederate Gen. Robert E. Lee's Army of Northern Virginia, ending Lee's attempt to invade the North. - The Chickamauga Campaign of the American Civil War was a series of battles fought in northwestern Georgia from August 21 to September 20, 1863, between the Union Army of the Cumberland and Confederate Army of Tennessee. The campaign started successfully for Union commander William S. Rosecrans, with the Union army occupying the vital city of Chattanooga and forcing the Confederates to retreat into northern Georgia. But a Confederate attack at the Battle of Chickamauga forced Rosecrans to retreat back into Chattanooga and allowed the Confederates to lay siege to the Union forces. Background. In his successful Tullahoma Campaign in the summer of 1863, William S. Rosecrans moved southeast from Murfreesboro, Tennessee, outmaneuvering Braxton Bragg and forcing him to abandon Middle Tennessee and withdraw to the city of Chattanooga, suffering only 569 Union casualties along the way. Union general-in-chief Maj. Gen. Henry W. Halleck and President Abraham Lincoln were insistent that Rosecrans move quickly to take Chattanooga. Seizing the city would open the door for the Union to advance toward Atlanta and the heartland of the South. Chattanooga was a vital rail hub (with lines going north toward Nashville and Knoxville and south toward Atlanta), and an important manufacturing center for the production of iron and coke, located on the navigable Tennessee River. Situated between Lookout Mountain, Missionary Ridge, Raccoon Mountain, and Stringer's Ridge, Chattanooga occupied an important, defensible position. - The Battle of Chickamauga, fought September 1820, 1863, marked the end of a Union offensive in southeastern Tennessee and northwestern Georgia called the Chickamauga Campaign. The battle was the most significant Union defeat in the Western Theater of the American Civil War and involved the second-highest number of casualties in the war following the Battle of Gettysburg. It was the first major battle of the war that was fought in Georgia. - Gordon Granger ( November 6 , 1821 -- January 10 , 1876 ) was a career U.S. army officer and a Union general during the American Civil War . He distinguished himself at the Battle of Chickamauga . After reading the paragraphs above, choose the best answer for the entity that related to 'gordon granger' with the relationship of 'military branch'. Choices: - army - army of northern virginia - union army
A:
union army