123rd Illinois Infantry Regiment

123rd Regiment, Illinois Volunteer Infantry/Illinois Volunteer Mounted Infantry
Illinois state flag
Active	September 6, 1862, to July 11, 1865
Country	United States
Allegiance	Union
Branch	Infantry Mounted Infantry (1863–1864)
Equipment	Spencer repeating rifle
Engagements	Battle of Perryville Battle of Stones River (Murfreesboro II) Battle of Vaught's Hill Battle of Hoover's Gap Battle of Chickamauga Battle of Farmington Atlanta Campaign Battle of Resaca Battle of New Hope Church Battle of Dallas Battle of Marietta Battle of Kennesaw Mountain Garrard's Raid Wilson's Raid Battle of Selma
Insignia
1st Division, XIV Corps
4th Division, XIV Corps

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.^{[note 1]}
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