Statistics for occurrence #1 of “Shenandoah Rivers” in chapter 22 of Benson J. Lossing, Pictorial Field Book of the Civil War. Volume 1.:

...Maryland Hights, opposite the Ferry, where they constructed a stockade and established a fortified camp. Early in June, the number of troops at and near the confluence of the Potomac and Shenandoah Rivers was full twelve thousand, composed of infantry, artillery, and cavalry. On the 23d of May, Joseph E. Johnston took the command of the insurgent forces at Harper's Ferry and in the Shenand...
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