Wherein Dumfries is of strategic importance
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With winter coming, General Joe Johnston, commanding the Department of Northern Virginia from his headquarters at Centreville, had two priorities: first, was to provide clothing, food, and dwellings for his men so they could survive the coming winter; second, was to make sure their defensive position was strong enough to defend against an attack by the Northern forces venturing further and further out from their defenses. Neither priority was close to being accomplished, but today we'll focus on defense.
By fiat from Richmond, Johnston's unified command had become three parts. His left-most flank was the Valley District, commanded by Maj. General Thomas Jackson, who people had taken to calling "Stonewall." Jackson, who Johnston had come to rely upon in their pre-Manassas days in the Shenandoah Valley and who he had high hopes for as a division commander, left the Army of the Potomac the first week of July to take over the rowdy militia of the Valley. Not surprisingly, a few days later his old brigade followed him, depriving Johnston of one of his best units. Richmond had also sent Jackson two brigades from across the Alleghenies along with their division commander William Loring, underscoring the importance of the Valley.
On his right-most flank was the second carve-out from Johnston's command, the Aquia District under Maj. General Theophilus Holmes. Stretching from Powell's Creek [Lake Montclair] to the Potomac to the Rappahannock, the district had resulted from the desire to keep Holmes in an important position. But it meant that Johnston's right-wing was effectively an independent force from his main body, the Army of the Potomac. Richmond intended that army to be the District of the Potomac, commanded by General G.T. Beauregard, but Johnston intended to command that army himself in battle, and had long-ago agreed to Beauregard's preference that he command the army's First Corps, with the Second led by Maj. General G.W. Smith.
All this mattered especially in the beginning of the third week of November because the Confederates had become well-aware that the Union Army of the Potomac had moved a division of soldiers opposite the Aquia District's batteries at Evansport [Quantico]. Though Holmes had known about the movement for several days already, it was a subordinate of G.W. Smith's who touched off the powder keg on November 16.
