George McClellan
George B. McClellan was the commander of the Union Army of the Potomac and Robert E. Lee was commanding the Confederate Army of Northern Virginia. Lee had just taken command three weeks earlier.
The answer to this question depends on how worst is defined. If worst is based on number of Union casualties and long term impact, it would be the Battle of Chancellorsville, which took place in Virginia between May 1 and May 4, 1863. The Union's casualties at the Battle of Chancellorsville exceeded those of the Confederacy by more than 4,000, 17,278 to 12,821. Union casualties during the four-day battle were the most of all other battles of the Civil War with the exception of Gettysburg and Spotsylvania. It was second only to the Seven Days battle for the most combatants of all Civil War battles with 195,000 total combatants. Considered General Robert E. Lee's greatest victory of the war, the Battle of Chancellorsville was a decisive victory for the Confederacy and a bitter and unexpected failure for the Union army resulting in the removal of General Joe Hooker of command of the Union Army by President Lincoln.
Battle Of Mechanicsville
The Union army under McClellan out of action for many weeks. McClellan's enemies in Washington prepare for his sacking. Lee's credibility at its peak - Confederate morale rises, Britain comes close to aiding the South.
McClellan's Union Army of the Potomac and Lee's Confederate Army were involved in the Seven Days Battle.
Second Manassas, Seven Days, Chancellorsville…
Wash their hands.
George B. McClellan commanded the Union army and Robert E. Lee the Confederates.
The seven days battles were a successful campaign by Robert E. Lee to drive the Union army away from Richmond, Virginia in summer 1862.
General Lee was forcing the Union army of General McClellan out of their lines threatening Richmond. The battles were very vicious, resulting in heavy casualties for both sides, the bloodiest day was at Malvern Hill.
The rebel army found Carlisle and Harrisburg undefended, and occupied them. Later, when the Union army under Meade came up through MAryland, the rebs left Carlisle to march south for two days to engage the Union Army. The met, by accident, in Gettysburg.
The Seven Days Battles were conducted by Robert E. Lee against the Union army under McClellan in Virginia.
George McClellan
Major General George Meade was named commander of the Army of the Potomac only three days prior to the battle at Gettysburg. Major General Henry Halleck was General-in-Chief of the U.S. Army at that time. And of course, Abraham Lincoln was commander in chief.
George B. McClellan was the commander of the Union Army of the Potomac and Robert E. Lee was commanding the Confederate Army of Northern Virginia. Lee had just taken command three weeks earlier.
The Battle of Glendale, fought on June 30, 1862, during the American Civil War, was part of the Seven Days Battles. It was primarily caused by the Confederate Army's attempt to thwart the Union Army's retreat toward the James River after the failed Peninsula Campaign. The Confederates aimed to exploit their numerical advantage and disrupt the Union's withdrawal, leading to intense fighting as both sides sought to control key positions. The battle resulted in a strategic stalemate, allowing the Union forces to continue their retreat.