The Battle of Shiloh, fought on April 6–7, 1862, was a major engagement in the American Civil War's Western Theater located in southwestern Tennessee. The Confederate Army of Mississippi sought to defeat Major General Ulysses S. Grant's Army of the Tennessee before Union reinforcements and resupply could arrive, making this battle a critical test of Confederate strategy in the western campaign.
The Confederate forces, under General Albert Sidney Johnston, launched a surprise attack on the first day of battle that achieved considerable gains. However, Johnston was mortally wounded during the fighting and was replaced by his second-in-command, General P. G. T. Beauregard. Despite the initial Confederate success, Grant's Army of the Tennessee was not eliminated as the Confederates had hoped. Overnight, Union strength was significantly bolstered when one of Grant's divisions stationed farther north reinforced the main army, and portions of the Army of the Ohio under Major General Don Carlos Buell arrived to join the Union forces.
The Union forces responded with an unexpected counterattack on the second day of battle. The combined Union armies defeated the Confederate Army of Mississippi, preventing the Confederates from achieving their objective of destroying Grant's army before reinforcement. The battle demonstrated the growing scale of Civil War combat and the importance of reinforcement and coordination between Union armies in the Western Theater. The fighting at Shiloh marked a significant moment in the war, as it showed that the conflict would be far more protracted and costly than many had initially anticipated.
The American Civil War (1861–1865) was the deadliest conflict in American history, killing an estimated 620,000 to 750,000 soldiers and an unknown number of civilians. The Confederate States of America, formed by eleven seceding Southern states, faced the Union in four years of warfare across 23 states and territories. Major engagements included First and Second Bull Run, Antietam (the bloodiest single day in American history, September 17, 1862), Chancellorsville, Gettysburg (July 1–3, 1863), Vicksburg (surrendered July 4, 1863), and Sherman's March through Georgia and the Carolinas (1864–1865). President Lincoln issued the Emancipation Proclamation on January 1, 1863, transforming the war's stated purpose to include the abolition of slavery and enabling the enlistment of approximately 180,000 Black men in the United States Colored Troops. Confederate General Robert E. Lee surrendered to Ulysses S. Grant at Appomattox Court House on April 9, 1865. The war resolved the question of secession and ended American slavery, though Reconstruction would face sustained resistance in its attempt to secure civil rights for formerly enslaved people.
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