The Conflict at Antientam: Malvern Hill and Union
The removal of McDowell to the Valley gave General Lee an opportunity of which he took instant advantage. McClellan's line of communication with York River had been left exposed, and the new Confederate commander, calling Jackson to his aid from the Valley, fell upon the Union army with an impetuosity which it proved unable to withstand. Thus began that remarkable series of battles which for seven days kept the cannon of the contending armies in unceasing roar.
An assault was made on Fitz-John Porter's post at Mechanicsville on June 26. He retired to his workes on Beaver Dam Creeks, where he was assailed on the 27th. Finding his lines flanked by Jackson's corps, he withdrw to a strong line of intrenchments at Gaines's Mills. Here he was exposed to a series of impetuous charges, in which the Confederates, after being several times repulsed, succeeded in gaining the crest of the ridge and breaking the Union lines. A retreat followed that was almost a panic, and only the approach of night put a stop to the salughter which had decimated Porter's broken ranks.
During the next day a general retreat of the Union columns began, McClellan cutting loose from his base on the York, and moving back towards the James River. The victorious Confederates followed, and several severe battles occurred during the following days. The Union rear-guard, with great courage, checked the pursuit at successive points, and on the 1st of July a pitched battle took place at Malvern Hill, in which the whole forces of both armies were engaged, and in which the assault of the Confederates on the Union intrenchments was repulsed with great loss. It is asserted by many historians that Lee's army was almost in a panic, and that a Union advance in force at that moment must have routed them ,and probably have placed Richmond in the hands of the Union army. Be that as it may, McClellan persisted in his plan of retreat. During the night Malvern Hill was deserted, ad by nightfall of the next day the Union army was safely gathered at Harrison's Landing, under the protection of the gunboats on the James River. This position was immediately fortified, and Lee made no effort to assail it. The loss on both sides had been enormous, though that of the Unionists had been considerably the greater, whie the main object of their campaign, the capture of Richmond, was completely frustrated.
Meanwhile, the three armies of Fremont, Banks, and McDowell had been massed into one, and placed under the command of General Pope, who had gained prominence by successes in the West. The design was to aid McClellan, but Lee's success rendered new plans necessary, and Pope's army was held between Richmond and Washington, as a cover to the latter city.
A covering force had become essential, for Lee soon began a series of bold movements which placed the seat of government in great jeopardy. In August he advanced towards the Rapidan, a menace which so disconcerted the Federal authorities that McClellan was hastily recalled from the James, and ordered to transport his army with all haste to Washington. The confederate force under Jackson was now sent on a rapid flanking march through Thoroughfare Gap in the Bull Run Mountains. Jackson reached the rear of Pope's army at Manassas Junction, at which point an immense quantity of army stores was captured, such as could not be carried off being dstroyed.
Pope, finding that Jackson was in his rear, and separated from the remainder of Lee's army, marched rapidly upon him, hoping to destroy him before he could effect a junction with Longstreet. But this movement seems to have been ill managed. Thoroughfare gap, Through which along Longstreet could come to jackson's aid, was weakly held, and a junction between the two divisions of Lee's army was suffered to be made almost without opposition. The failure to overwhelm Jackson was ascribed by Pope to disobedience of orders on the part of Fitz-John Porter, and this general was subsequently court-martialled and dismissed the service, his explanation of the circumstances not beign accepted as satisfactory.
The engagement with Jackson occurred on August 29. On the succeeding day the battle was renewed, Pope being now confronted by the whole of Lee's army. The conflict ended in a disastrous repulse of the Union army, it being driven beyond Bull Run, with serious loss. On the 31st, Pope fell back to Centreville, a point more immediately covering Washington. A minor conflict took place on the evening of that day, near Chantilly, in which Generals Kearney and Stevens were killed. Pope now resigned his command, having lost during the campaign about thirty thousnand men, thrity guns, twenty thousand small-arms,and vast quantities of supplies and munitions. Lee's loss numbered about fifteen thousand men.