The Battle of Antietam (Sharpsburg)
The Battle of Antietam was an important battle during the American Civil War. The battle took place on September 17, 1862. This was the first battle to take place in the north, in an Union state, Maryland.
Before the Battle
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Robert E. Lee |
After defeating the Union army under John Pope at the Battle of Second Manassas, Confederate General Robert E. Lee was faced with a question. What do I do now? Although he won a great battle for the Confederacy, he had failed in his quest to destroy the Union army, and was not sure what his next move was. Believing his options were limited, Lee decided to embark on a bold and daring strategy, to invade the north. Although his Army of Northern Virginia was low on supplies, ammunition as well as food rations,Lee believed that the Union army would be demoralized after their defeat at Second Manassas and would be not be able to perform offensive maneuvers for several weeks. Not only that, Lee believed his army would be viewed as liberators, since Maryland was a border state and allowed slavery, he thought that the people of Maryland would flock to his army to join the fight against the Union. Most importantly though, Lee believed that if he was successful in his invasion of the north, European powers such as France and Great Britain would be enticed to acknowledge the Confederacy as a legitimate nation and would enter in the war on their side.
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Thomas "Stonewall" Jackson |
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Lafayette McLaws |
Lee's plan for invasion of the north was a very risky proposition. It was risky because it called for the dividing of the Confederate army, which went against all military training. His plan, titled "Special Order 191," divided the Confederate army into four different parts. Three armies were divided and put under the command of threegGenerals, "Stonewall Jackson, Lafayette McLaws, and John Walker, were to attack the Union city of Harpers Ferry. By attacking Harpers Ferry, Lee would be able to establish a line of supply as well as communications for his army. The other part of the army would be divided into divisions under the command of General James Longstreet, who would take up position at Boonsboro, Maryland and wait to be re-joined by the Jackson, McLaws, and Walker's forces.
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John Walker |
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James Longstreet |
Lee's plan was distributed in the form of paper amongst the his various officers. The papers told them the details of the entire now divided movement for the next three days, as movement was to begin the next day, the 10th and have concluded on the 12th. Unknown by Lee, was a duplicated copy of the written orders of Lee's invasion plan, for one of the divisional leaders iin"Stonewall" Jackson's army. This duplicated copy, was wrapped around three cigars and must have been dropped on accident by the officer, because on September 13th, the plans were spotted on the ground at a recent Confederate camp but union soldiers. The soldiers seeing the content written on the piece of paper immediately reported the finding to their immediate officer, and within the hour, the document was in General George McClellan's hands.
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George McClellan |
The magnitude of the find was tremendous. The document gave McClellan the location of the entire Confederate army. What was more, was the McClellan was closer to the Confederate's two halves of the army than they were to each other, meaning that the Union army would have the opportunity to destroy the two separated Confederate halves one at a time. Unfortunately for McClellan there was a Confederate sympathizer within his camp who ran off and told the Confederates the news of McClellan knew the various positions of the Confederate army. McClellan being the kind of person he was, was very slow to react to this newly found intelligence. He spent two days dividing up the Union army into two wings, the right and left, to allow the army to march faster on the Confederate position. On top of that, McClellan still believed that Lee outnumbered him and was cautious during his march towards Boonsboro. On the 14th of September, Union and Confederate forces faced off in the Battle of South Mountain, were the much smaller Confederate force was able to hold off the much larger Union force. Around the same time as the Battle of South Mountain was happening "Stonewall" Jackson was seeing a white flag emit from the Harpers Ferry garrison. Over 12,000 Union soldiers were taken captive as well and the Confederates gladly took the vast amount of supplies which were located there. A.P. Hill was left one division to take care of the prisoners and various other tasks at Harpers Ferry.
Due to McClellan's inactivity on the 15th, Lee was able to combine much of his once divided army back into one, since most of the army had as the had fallen back to the town of Sharpsburg. The Union army was there as well but was content to bring up their forces into position. On the 16th McClellan decides to spend the day looking at the layout of the land at and around Sharpsburg. Viewing the land, McClellan finally coordinates an attack plan for tomorrow, but his delay in attacking the Confederates yet again, gave the Confederates more time to fortify their defenses.
September 17th: The Battle
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Joseph Hooker |
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John Bell Hood |
The The battle began at dawn on the Confederate left. Union forces under Joseph Hooker are led from the woods fighting Confederate forces all the way toward the focal point on the left flank, the famous cornfield. Taking heavy causalities while moving forward, Hooker and his troops appear to be taking the field when to his dismay, Confederate forces under John Bell Hood emerge from the west wood, the woods directly behind the cornfield, and delivered volleys at pointblank range. Its effect was devastating. Hooker's forces were driven back from the back beyond the cornfield. While this occurred corps under the command of Joseph Mansfield which were stationed at the edge of east woods, the woods on the other side of the cornfield, repulsed the counterattack by Hood's Texans and preformed a counterattack of their own. This counterattack pushed the Confederates back to through the cornfield to the west woods, however, before this happens Mansfield was shot and killed, never seeing his troops repulse the Confederate advance.
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Joseph Mansfield |
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Edwin Sumner |
In order to avoid being overrun by the Union on the left, Lee pulled Walker's divisions from the center of the battle and sent them to the left side of the battle. Walker's troops arrived just like Hood's forces earlier in the day at the climax, and successfully stopped the Union advancement, but not dislodging them from their position. Reinforcements under Corps commander Edwin Sumner march toward the center of the battle on the left side of the cornfield (from Union vantage point) but before they can get to Mansfield's troops, Lafayette McLaws who was leading his troops to reinforce Walker's forces completely annihilated Sumner's forces, "more than two thousand of them were shot down within quarter of an hour" (Foote, 692). This caused Union forces to retreat and the battle on the Confederate left flank was over.
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D.H.Hill |
The middle part of the battle was just getting started as McLaw's forces were causing the shattered Union left to retreat. Confederate forces under D.H. Hill, were located in one of Sharpsburg's road's called the sunken road. The road was called this because the road really sunk in, and this acted like a barricade providing Confederate forces some protection from Union barrages. Problems arose here for the Confederates when a divisional officer was shot and killed, leaving a large portion of Hill's force leaderless and in effect largely effective as they no longer fought as a unit, rather they fought as individuals. The other problem occurred when a Confederate brigade retreated from the field after misunderstanding a command, which opened up the Hill's left flank. Union forces soon were able to converge on Hill's flank and decimated his forces as they retreated. Union forces proceeded to follow Hill's retreating forces when Hill somehow managed to to rally some of his forces. Convinced that he would not be able to hold the line, Hill's depleted forces counterattacked and caused the much larger Union force to retreat, and to Hill's relief did not attack again.

The last part of the battle took place on the Confederate right flank. A Union Corps under the command of Ambrose Burnside had ineffectively been probing and trying to find away to Antietam Creek. For several hours Burnside looked for a natural ford to cross, but by the time his forces found one, two of his division's had already taken the bridge and were ready to attack. At this point, however, the lead division realized they had ran out of ammunition, and instead of bringing up ammo for this division Burnside decided to bring up a whole new division. This took time, two hours in fact, and was known as the "great lull." Once in position, Burnside began the attack. Confederates at this point were not in good position. Lee had thinned out their right flank in order to repeal the Union attack on the left and in effect, had left the right flank too weak to repeal a Union attack.
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A.P. Hill |
This becomes apparent as Union forces push the Confederates back, however, at the last possible moment A.P. Hill's division arrived from Harpers Ferry. He had left one brigade to finish the work left at Harpers Ferry and had sent the other five on the way to Sharpsburg. His division had started out with 5000 troops on the 17 mile march and arrived with only 3000 men, as the rest were scattered along the way due to pure exhaustion. His division arrived at precisely the right moment and was able to repel the Union advance until the cover of darkness. The next day each side perpares for the expected attack from the opposing side, it never happens. On the 19th Lee retreats, and McClellan against the wishes of Lincoln, does not pursue Lee's Army and misses out of his best chance to destroy the Confederate army. The Battle of Antietam is officially over. Over 23,000 soldiers were either killed, wounded, or were labeled missing.
In military terms, the battle itself was a draw, however, the Union declared itself the victory because Lee had retreated. This "victory" allowed Lincoln the chance to issue his famous
Emancipation Proclamation. In reality though, the battle was a Confederate victory due to the fact that McClellan was unable to destroy the Confederate army.
Links
http://www.history.com/videos/the-battle-of-antietam#the-battle-of-antietam
http://www.historyanimated.com/AntietamAnimation.html