Statistics for occurrence #1 of “Martinsburg, Virginia” in chapter 3.9 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 1: The Opening Battles.:

...he order of the day in camp. he remained in Washington. The immediate command of the army was entrusted to Brigadier-General Irvin McDowell. Another Union army, twenty thousand strong, lay at Martinsburg, Virginia , under the command of Major-General Patterson, who, like General Scott, was a veteran of the War of 1812 and of the Mexican War. Opposite McDowell, at Manassas Junction, about thirty miles from W...
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