On the 3rd of June, 1861, General McDowell, in command of the Department of North-Eastern Virginia, with head-quarters at Arlington, near Washington, receives from Colonel Townsend, Assistant Adjutant-General with Lieutenant-General Scott—who is in Chief command of all the Union Forces, with Headquarters at Washington—a brief but pregnant communication, the body of which runs thus: "General Scott desires you to submit an estimate of the number and composition of a column to be pushed toward Manassas Junction, and perhaps the Gap, say in four or five days, to favor Patterson's attack on Harper's Ferry. The rumor is that Arlington Heights will be attacked to-night."
In response to this request, General McDowell submits, on the day following, an estimate that "the actual entire force at the head of the column should, for the purpose of carrying the position at Manassas and of occupying both the road to Culpepper, and the one to the Gap, be as much as 12,000 Infantry, two batteries of regular Artillery, and from six to eight companies of Cavalry, with an available reserve, ready to move forward from Alexandria by rail, of 5,000 Infantry and one heavy field battery, rifled if possible; these numbers to be increased or diminished as events may indicate." This force of raw troops he proposes to organize into field brigades under the command of "active and experienced colonels" of the regular Army. And while giving this estimate as to the number of troops necessary, he suggestively adds that "in proportion to the numbers used will be the lives saved; and as we have such numbers pressing to be allowed to serve, might it not be well to overwhelm and conquer as much by the show of force as by the use of it?"
Subsequently McDowell presents to General Scott, and Mr. Lincoln's Cabinet, a project of advance and attack, which is duly approved and ordered to be put in execution. In that project or plan of operations, submitted by verbal request of General Scott, near the end of June,—the success of which is made contingent upon Patterson's holding Johnston engaged at Winchester in the Shenandoah Valley, and also upon Butler's holding the Rebel force near Fortress Monroe from coming to Beauregard's aid at Manassas Junction,—McDowell estimates Beauregard's strength at 25,000, with a possible increase, bringing it up to 35,000 men. The objective point in McDowell's plan, is Manassas Junction, and he proposes "to move against Manassas with a force of 30,000 of all arms, organized into three columns, with a reserve of 10,000."
McDowell is fully aware that the Enemy has "batteries in position at several places in his front, and defensive works on Bull Run, and Manassas Junction." These batteries he proposes to turn. He believes Bull Run to be "fordable at almost anyplace,"—an error which ultimately renders his plan abortive,—and his proposition is, after uniting his columns on the Eastern side of Bull Run, "to attack the main position by turning it, if possible, so as to cut off communications by rail with the South, or threaten to do so sufficiently to force the Enemy to leave his intrenchments to guard them."
In other words, assuming the Enemy driven back, by minor flanking movements, or otherwise, upon his intrenched position at Bull Run, or Manassas, the plan is to turn his right, destroy the Orange and Alexandria railroad leading South, and the bridge at Bristol, so as to cut off his supplies. This done, the Enemy—if nothing worse ensues for him—will be in a "bad box."
McDowell, however, has no idea that the Enemy will stand still to let this thing be done. On the contrary, he is well satisfied that Beauregard will accept battle on some chosen ground between Manassas Junction and Washington.
On the afternoon of Tuesday, the 16th of July, the advance of McDowell's Army commences. That Army is organized into five divisions—four of which accompany McDowell, while a fifth is left to protect the defensive works of Washington, on the South bank of the Potomac. This latter, the Fourth Division, commanded by Brigadier-General Theodore Runyon, comprises eight unbrigaded New Jersey regiments of (three months, and three years) volunteers—none of which take part in the ensuing conflicts-at-arms.
The moving column consists of the First Division, commanded by Brigadier-General Daniel Tyler, comprising four brigades, respectively under Brigadier-General R. C. Schenck, and Colonels E. D. Keyes, W. T. Sherman, and I. B. Richardson; the Second Division, commanded by Colonel David Hunter, comprising two brigades, under Colonels Andrew Porter and A. E. Burnside respectively; the Third Division, commanded by Colonel S. P. Heintzelman, comprising three brigades, under Colonels W. B. Franklin, O. B. Wilcox, and O. O. Howard, respectively; and the Fifth Division, commanded by Colonel Dixon S. Miles, comprising two brigades, under Colonels Lewis Blenker, and Thomas A. Davies, respectively.
Tyler's Division leads the advance, moving along the Leesburg road to Vienna, on our right, with orders to cross sharply to its left, upon Fairfax Court House, the following (Wednesday) morning. Miles's Division follows the turnpike road to Annandale, and then moves, by the Braddock road,—along which Braddock, a century before, had marched his doomed army to disaster,—upon Fairfax Court House, then known to be held by Bonham's Rebel Brigade of South Carolinians. Hunter follows Miles, to Annandale, and thence advances direct upon Fairfax, by the turnpike road—McDowell's idea being to bag Bonham's Brigade, if possible, by a simultaneous attack on the front and both flanks. But the advance is too slow, and the Enemy's outposts, both there and elsewhere, have ample opportunity of falling safely back upon their main position, behind the stream of Bull Run.
[McDowell in his testimony before the "Committee on the Conduct of the War," said: "At Fairfax Court House was the South Carolina Brigade. And I do not suppose anything would have had a greater cheering effect upon the troops, and perhaps upon the Country, than the capture of that brigade. And if General Tyler could have got down there any time in the forenoon instead of in the afternoon, the capture of that brigade was beyond question. It was about 5,000 or 6,000 men, and Tyler had 12,000, at the same time that we were pressing on in front. He did not get down there until in the afternoon; none of us got forward in time.">[