Statistics for occurrence #1 of “Northern Virginia” in chapter 10 of Brigadier-General Ellison Capers, Confederate Military History, a library of Confederate States Military History: Volume 5, South Carolina:

...on and detachments from his command. These brilliant achievements of the cavalry were acknowledged and published in orders to the army by General Lee, as follows: Headquarters Army of Northern Virginia , February 28, 1863. The general commanding announces to the army the series of successes of the cavalry of Northern Virginia during the winter months, in spite of the obstacles of almost impassab...
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