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As the day of battle at Antietam approached, Union General George B. McClellan miscalculated the number of troops that General Robert E. Lee had at his disposal on September 15, 1862. In fact Lee had less than half of the troops with which McClellan gave him credit for. There were logical reasons for this and they were not related to any of McClellan's previous problems when on a potential offensive as with the Peninsula campaign.McClellan and his commanders were misguided because:


1. A faulty intelligence gathering system;

2. The number of Confederate regimental flags that were visible on Lee's front lines;

3. The number of guns firing from Lee's lines at the Union position; and

4. Federal scouts had trouble determining whether fifty or five hundred rifles were being fired.


The situation was that although Lee's troops were depleted, the regiment flags were still posted indicating to McClellan that the regiments were in full force. They were not.

Confederate General Longstreet purposely had his artillery batteries firing at a super fast volume, deceiving the Federals.


Based on the above factors, McClellan decided to postpone any offensive decisions to the next day, the 16th which was also another missed opportunity.

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Q: What caused Union General George B McClellan to overestimate the strength of Lee's forces at Sharpsburg?
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How many Confederate troops did General George B McClellan believe he would have to face in a battle at Sharpsburg in 1862?

Major George B. McClellan received poor advice from his cavalry and from local citizens regarding the number of troops he would have to battle against at Sharpsburg, known better as the Battle of Antietam. McClellan believed that Stonewall Jackson commanded between 40 to 50,000 troops and were close to joining General Lee at Sharpsburg, who commanded 30,000 soldiers.McClellan's estimates were vastly off target. When the Battle of Antietam finally began on September 17, 1862, Lee's total number of troops were barely 39,000.


Where did the battle take place Antietam?

The Battle of Antietam took place near the Antietam Creek, near Sharpsburg, Maryland in September of 1862. This was the first time Confederate General Lee took his forces into Union territory. Maryland was a slave state that remained in the Union. It was one of the bloodiest battles in American history. Union General Burnside, under the command of General George B. McClellan forced Lee back into Virginia as a result of the battle. Not long afterwards US President Lincoln visited General McClellan to see the battlefield itself.


What was Major General George B. McClellan's best opportunity to inflict severe damages on General Lee's forces in Maryland in 1862?

On September 16, 1862, one day before the historic Battle of Antietam, Major General George B. McClellan lost his best opportunity to defeat General Lee's army in detail in Maryland. McClellan was slow to assemble his forces in and around the town of Sharpsburg, Maryland. McClellan was unaware that he substantially outnumbers Lee's army and postpones an attack on the Confederates. Instead he waits another day until his reserve forces joins his main army. Theoretically, if McClellan conducted an assault on September 16, the Battle of Antietam would have been a smashing Union victory.


What generals opposed each other at the Battle of Antietam?

The Battle of Antietam, an important battle of the Civiil War, was fought by the Army of the Potomac, part of the Union Army, under the command of General George McClellan, and Confederate forces under the command of General Robert E. Lee on September 17, 1862.


What two corps did General McClellan not send to reinforce General Pope's troops at Manassas?

Two corps of the Army of the Potomac were under General McClellan's control at Alexandria. They were General Sumner's Second Corps and General Franklin's Sixth Corps. This totaled 25,000 troops. McClellan saw General Pope as incompetent and did not want to waste good troops to save Pope's hopeless situation. General in Chief Henry W. Halleck ordered McClellan to send these troops to reinforce Pope. McClellan held back these troops as long as possible. McClellan also urged General Pope to not engage the Rebel troops and to retreat to the north.

Related questions

How many Confederate troops did General George B McClellan believe he would have to face in a battle at Sharpsburg in 1862?

Major George B. McClellan received poor advice from his cavalry and from local citizens regarding the number of troops he would have to battle against at Sharpsburg, known better as the Battle of Antietam. McClellan believed that Stonewall Jackson commanded between 40 to 50,000 troops and were close to joining General Lee at Sharpsburg, who commanded 30,000 soldiers.McClellan's estimates were vastly off target. When the Battle of Antietam finally began on September 17, 1862, Lee's total number of troops were barely 39,000.


Where did the battle take place Antietam?

The Battle of Antietam took place near the Antietam Creek, near Sharpsburg, Maryland in September of 1862. This was the first time Confederate General Lee took his forces into Union territory. Maryland was a slave state that remained in the Union. It was one of the bloodiest battles in American history. Union General Burnside, under the command of General George B. McClellan forced Lee back into Virginia as a result of the battle. Not long afterwards US President Lincoln visited General McClellan to see the battlefield itself.


Where on the battlefield were most of General Lee's troops on September 17 1862?

The Battle of Antietam took place on September 17, 1862. At the onset of the battle most of Lee's troops were in defensive positions to the west of the Antietam Creek. The town of Sharpsburg lay between to sections of Lee's army. Lee had made his headquarters on the southwest side of the town of Sharpsburg. Union General George B. McClellan was headquartered to the northeast of Lee. McClellan had made the east side of Antietam Creek. He was directly next to the Creek itself.


What critical miscalculation prevented Union George B McClellan from a total victory at Sharpsburg?

As the actual Battle of Antietam was soon to take place, General McClellan miscalculated the number of troops that Confederate General Robert E. Lee had on September 15, 1862, just two days from the Battle of Antietam.In actuality, Lee had only one half of the troops that General McClellan believed he had. If McClellan had attacked Lee's forces on the 15th of September, by all counts, the Army of Northern Virginia would have lost an overwhelming amount of its troops. As it happened, Lee had only 18,000 troops ready to fight versus McClellan's 40,000 troops. McClellan failed to attack.


What quality did general mcclellan may have hurt the union and helped the south?

General George B. McClellan was best known for his thorough planning and attention to the details of his army, but this quality also served as a double-edged sword in that he would often overestimate the strength of his enemy. This proved costly in battles such as Antietam, in which while technically winning due to Robert E. Lee's retreat, his hesitation in deploying his reserves to capitalize on the local successes throughout the battle would ultimately allow General Lee to escape with a large portion of his force intact. McClellan's giving in to caution and refusing to pursue Lee following the battle ultimately led to his removal by President Lincoln, and his replacement by General Ambrose Burnside.


When did Union General George B McClellan plan on reoccuping Harper's Ferry in 1862?

After the US Civil War Battle of Antietam, Union General George B. McClellan remained in Sharpsburg, Maryland until the 26th of September. From his headquarters there he wired Henry Halleck that he would reoccupy Harper's Ferry in a day or two. This was possible as the Army of Northern Virginia was heading back to Virginia.


Abraham Lincoln's response to General McClellan's Command?

Lincoln's response to General McClellan's command was that Lincoln relieved McClellan of Command.


What was Major General George B. McClellan's best opportunity to inflict severe damages on General Lee's forces in Maryland in 1862?

On September 16, 1862, one day before the historic Battle of Antietam, Major General George B. McClellan lost his best opportunity to defeat General Lee's army in detail in Maryland. McClellan was slow to assemble his forces in and around the town of Sharpsburg, Maryland. McClellan was unaware that he substantially outnumbers Lee's army and postpones an attack on the Confederates. Instead he waits another day until his reserve forces joins his main army. Theoretically, if McClellan conducted an assault on September 16, the Battle of Antietam would have been a smashing Union victory.


What were Union General George B McClellan's calculations on the strength of the Southern armies at Antietam before the battle took place?

The movement of Lee's Army of Northern Virginia north over the Potomac River into Maryland, was a protracted march that left many opportunities for the Union to slip by towards totally defeating Lee's army. On the morning of September 16, 1862, McClellan had almost all of his forces within striking distance of Lee's forces near the Antietam Creek. Lee's army was still divided. McClellan's estimates of Lee's strength was wrong. The day earlier, he believed that Lee had at least 30,000 troops at Sharpsburg and 45,000 troops at Harper's Ferry.


What was the contents of the scouting report furnished by Captain Custer to General George B McClellan on September 15 1862?

Captain George Custer was on a scouting mission for General George B. McClellan on September 15, 1862. He reported to the general that he had observed the Confederate army in full view and in perfect line, established on a ridge near Sharpsburg. Custer noted that the Rebel battle line was one and a half miles long and that Confederate General Longstreet had forty cannons.


Why was the Battle of Antietam in Sharpsburg?

Sharpsburg was the nearest town, and that was how the Confederates preferred to name their battles. The fighting occurred beside Antietam Creek, the spot where Lee had to concentrate his scattered divisions in a hurry, after a set of his orders had accidentally fallen into the hands of the Union commander McClellan. Although this was the Northern win that Lincoln had been waiting for (to give him the credibility to issue the Emancipation Proclamation), he was losing his patience with McClellan who had failed to exploit his opportunity to destroy Lee's army, and allowed it to get safely back to Virginia. A few weeks later, McClellan's military career was over, and he would be running against Lincoln in the 1864 General Election.


How many troops did General George B. McClellan want to have for the Army of the Potomac in the Fall of 1861?

General George B. McClellan was constantly fearful of what he believed was the troop strength of the Confederate armies he would face. With that in mind, McClellan believed that the Army of the Potomac would have to have at least 150,000 troops before he would order any offensives against the South.