As the Battle of Gettysburg opened on July 1, VI Corps was among the farthest Union formations from the town. The Battle of Gettysburg took place from July 1 to July 4, 1863, with the Union Army of the Potomac under the command of Major General George G. Meade against the Confederate Army of Northern Virginia under General Robert E. Lee. General George B McClellan was notified on November 7, 1862 that he was relieved of his position as commanding officer of the Army of the Potomac. Prodded by President Abraham Lincoln, Maj. Gen. Joseph Hooker moved his army in pursuit, but was relieved of command just three days before the battle and replaced by Meade. Prodded by President Abraham Lincoln, Maj. Gen. Joseph Hooker moved his army in pursuit, but was relieved of command just three days before the battle and replaced by Meade. Pushing hard through the day on July 1 and 2, Sedgwick's lead elements began to reach the fight late on the second day. As the army marched north in pursuit, Hooker was relieved of command and replaced with Major General George G. Meade. Elements of the two armies initially collided at Gettysburg on July 1, 1863, as Lee urgently concentrated his forces there, his objective being to engage the Union army and destroy it. Led by Major General George G. Meade, Union forces fought a defensive battle and triumphed. While some VI Corps units aided in holding the line around … The Battle of Gettysburg was … His choice would set the stage for the Battle of Gettysburg that began the following day, July 1, 1863. Leading up to the great battle of Gettysburg General Robert E. Lee had been on a winning streak. Fought in July 1863, the Battle of Gettysburg saw Union commanders and the Army of the Potomac defeat the Confederate Army of Northern Virginia. General John Reynolds - One of the most highly respected and dynamic Union generals serving in the Army of the Potomac, Reynolds commanded the First Army Corps. The battle of Chancellorsville was a great battle and for Lee and his troops was the confidence builder. After the battle of Chancellorsville Lee knew that the only way the Confederate army could win was if they started to win battles in the Northern Territory and that would shift the momentum so Lee started to … In three days of fighting nearly 50,000 casualties would be claimed in the largest battle ever fought in the Civil War.