Statistics for occurrence #1 of “Northern Virginia” in entry lee-robert-edward of Harper's Encyclopedia of United States History:

...Jefferson Davis and of the Confederate Secretary of War. When Gen. Joseph E. Johnston was wounded (May 31, 1862), in the battle of Seven Pines, near Richmond, the command of the Confederate army of Northern Virginia was given to Lee, June 3, and on the 26th of that month he began the series of conflicts before Richmond known as the Seven Days Battles. He was finally compelled to surrender his army to General G...
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