When conducting large marching exercises General McClellan followed what seems to be a standard practice for Union as well as for Confederate armies. In open country, the cavalry would lead the advance guard followed by infantry units. In rough terrain, the infantry would lead and the cavalry would confine themselves to being a rear guard and having the duty of providing intelligence on any enemy forces that may be approaching from the rear of the main infantry unit.
General George B. McClellan had two strong points. He knew how to train an army and he was excellent at multi-theater strategy. He spent 8 months drilling his new Army of the Potomac. They were in top shape due to his meticulous drills and marching techniques.As an aside, McClellan had the weakness of being a poor tactical general.
Lincoln's response to General McClellan's command was that Lincoln relieved McClellan of Command.
US President Abraham Lincoln summoned General George McClellan to the capital. McClellan took charge of Federal troops in Washington DC on July 26, 1861. At that time he became Lincoln's most influential military adviser. In consultation with Lincoln and General Scott, McClellan developed a general plan of operations that he envisioned to be the actions of of the Union's strategic course of action. As with any military plans, the movements of Southern forces, would alter the Union's general plans. With that said, McClellan's overall initial strategies would become the basis of Federal operations against the Confederacy.
Lincoln fired several generals. He fired McClellan twice.
General George B. McClellan
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.
McClellan's Peninsular campaign failed because the Confederate army was defending Richmond better that McClellan anticipated. They retreated, then turned and attacked McClellan, surprising the Union general.
General George B. McClellan.
General McClellan :D
Ambrose Burnside
As the new Union General in Chief George B. McClellan was making plans in the East for the Army of the Potomac, General McClellan did not neglect the Western Theater. He appointed General Don Carlos Buell to head the Department of Ohio, and General Henry W. Halleck to head the Department of Missouri. As an aside, at the time, little did both McClellan nor Halleck know that before the year of 1862 was over, Halleck would replace McClellan as general in chief.
General George B. McClellan supported the Union. He was also a Democrat and supported that party which made him their candidate for the presidency in 1864.