Statistics for occurrence #1 of “Northern Virginia” in chapter 14 of William Swinton, Campaigns of the Army of the Potomac:

...ich Mountain. Lee, General Robert E., appointed major-general, and commander of the Virginia forces, 26; defence of West Virginia, 34; on the poor discipline of the army, 67; appointed to Army of Northern Virginia , 142; withdraws Jackson from Shenandoah Valley, 148; plan of attack on the Chickahominy, 144; concentrated at Newmarket Crossroads, 159; on the battle of Malvern Hill, 163; after Malvern Hill battle ...
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