The Battle of Chickamauga, fought on September 18–20, 1863, between the United States Army and Confederate forces in the American Civil War, marked the end of a U.S. Army offensive, the Chickamauga Campaign, in southeastern Tennessee and northwestern Georgia. It was the first major battle of the war fought in Georgia, the most significant US defeat in the Western Theater, and involved the second-highest number of casualties after the Battle of Gettysburg.
The Battle of Hoover's Gap was the principal battle in the Tullahoma Campaign of the American Civil War, in which Union General William S. Rosecrans drove General Braxton Bragg’s Confederates out of Central Tennessee. Rosecrans’ feigned move on the western end of the Confederate line had left the eastern mountain passes lightly defended, and Colonel John T. Wilder's mounted infantry achieved total surprise when they attacked Hoover's Gap. Success was attributed both to Rosecrans’ brilliant deception tactics and the high morale of Wilder’s "Lightning Brigade", equipped with the new Spencer repeating rifle.
The Tullahoma campaign was a military operation conducted from June 24 to July 3, 1863, by the Union Army of the Cumberland under Maj. Gen. William Rosecrans, and is regarded as one of the most brilliant maneuvers of the American Civil War. Its effect was to drive the Confederates out of Middle Tennessee and to threaten the strategic city of Chattanooga.
The Battle of Wauhatchie was fought October 28–29, 1863, in Hamilton and Marion counties, Tennessee, and Dade County, Georgia, in the American Civil War. A Union force had seized Brown's Ferry on the Tennessee River, opening a supply line to the Union army in Chattanooga. Confederate forces attempted to dislodge the Union force defending the ferry and again close this supply line but were defeated. Wauhatchie was one of the few night battles of the Civil War.
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.
The 17th Indiana Infantry Regiment, also known as 17th Indiana Mounted Infantry Regiment, was an infantry and mounted infantry regiment that served in the Union Army from 1863 to 1865 during the American Civil War. It served in West Virginia before being transferred to the Western Theater. In that theater, it was known for its membership in the "Lightning Brigade."
The 98th Regiment Illinois Volunteer Infantry, later the 98th Regiment Illinois Volunteer Mounted Infantry, was an infantry and mounted infantry regiment that served in the Union Army during the American Civil War.
The 88th Illinois Infantry Regiment was an infantry regiment from Illinois that served in the Union Army during the American Civil War. The regiment mustered into service in September 1862 and was engaged at Perryville a month later. The unit subsequently fought at Stones River, in the Tullahoma campaign, at Chickamauga, at Missionary Ridge, in the Atlanta campaign, at Franklin, and at Nashville. The 88th Illinois especially distinguished itself at Stones River, Missionary Ridge, and Franklin. The regiment mustered out of service in June 1865.
The 92nd Regiment Illinois Infantry, also known as 92nd Illinois Mounted Infantry Regiment, was an infantry and mounted infantry regiment that served in the Union Army during the American Civil War.
The 21st Ohio Infantry Regiment was an infantry regiment in the Union Army during the American Civil War. Mostly an all-volunteer unit, with the exception of a few draftees, the 21st Ohio served for both ninety-day and three-year enlistments and fought exclusively in the Western Theater. It saw action in some of the war's bloodiest battles including Stones River, Chickamauga, the Atlanta Campaign, and Sherman's March to the Sea.
The 123rd Regiment Illinois Volunteer Infantry, was an infantry and mounted infantry regiment that served in the Union Army during the American Civil War. In 1863 and 1864 it was temporarily known as the 123rd Illinois Volunteer Mounted Infantry Regiment, as part of Wilder's Lightning Brigade.
The Chattanooga campaign was a series of maneuvers and battles in October and November 1863, during the American Civil War. Following the defeat of Maj. Gen. William S. Rosecrans's Union Army of the Cumberland at the Battle of Chickamauga in September, the Confederate Army of Tennessee under Gen. Braxton Bragg besieged Rosecrans and his men by occupying key high terrain around Chattanooga, Tennessee. Maj. Gen. Ulysses S. Grant was given command of Union forces in the West, now consolidated under the Division of the Mississippi. Significant reinforcements also began to arrive with him in Chattanooga from Mississippi and the Eastern Theater. On October 18, Grant removed Rosecrans from command of the Army of the Cumberland and replaced him with Major General George Henry Thomas.
The 18th Independent Battery Indiana Light Artillery, also known as Lilly's Hoosier Battery and Lilly's Battery, was a civil war regiment formed in Indiana during the American Civil War. The regiment was formed at the end of 1860 by 22-year-old Eli Lilly, an Indianapolis pharmacist. He had recruitment posters placed around the city and recruited primarily among his friends and classmates. The unit contained six 10-pounder Parrott rifles, and was manned by 150 men. The unit mustered in Indianapolis where it was drilled during 1861. Lilly was elected captain of the unit in August 1862 when the unit was deployed to join the Lightning Brigade commanded by Col. John T. Wilder.
The 10th Kentucky Infantry Regiment was a three-year volunteer infantry regiment that served in the U.S., or Union Army during the American Civil War.
The 74th Indiana Infantry Regiment, officially known as the 74th Regiment, Indiana Volunteer Infantry, was an infantry regiment that served in the Union Army during the American Civil War.
The 72nd Indiana Infantry Regiment, also known as 72nd Indiana Mounted Infantry Regiment, was an infantry and mounted infantry regiment that served in the Union Army during the American Civil War. The regiment served as mounted infantry from March 17, 1863, to November 1, 1864, notably as part of the Lightning Brigade. during the Tullahoma and Chickamauga Campaigns.
William J. Carson was a United States Army soldier and recipient of the United States' highest military decoration, the Medal of Honor, for his actions at the Battle of Chickamauga in the American Civil War.
The Lightning Brigade, also known as Wilder's Brigade or the Hatchet Brigade was a mounted infantry brigade from the American Civil War in the Union Army of the Cumberland from March 8, 1863, through November 1863. A novel unit for the U.S. Army, its regiments were nominally the 1st Brigade of Maj. Gen. Joseph J. Reynolds' 4th Division of Thomas' XIV Corps. Operationally, they were detached from the division and served as a mobile mounted infantry to support any of the army's corps. Colonel John T. Wilder was its commander. As initially organized, the brigade had the following regiments:
Chattanooga, Tennessee, was a major rail center and a strategic vantage-point, with high ground competed-for by both sides. When Union forces were besieged in the town, General Ulysses S. Grant forced a supply-route, earning him Lincoln's particular gratitude.
Henry Benedict Mattingly was a Union Army soldier in the American Civil War and a recipient of the United States military's highest decoration, the Medal of Honor, for his actions at the September 1, 1864, Battle of Jonesborough, Georgia.
Colonel 
Brevet Brigadier General 
