Statistics for occurrence #1 of “Pennsylvania” in chapter 1 of Adam Badeau, Military history of Ulysses S. Grant from April 1861 to April 1865. Volume 3:
...Rapidan after the battle of the Wilderness.
It had now, however, become essential to defeat the movement of Early.
Disaster in the Valley would lay open to the rebels the states of Maryland and Pennsylvania for long distances before another army could be interposed to check them; while the Baltimore and Ohio railroad, as well as the Chesapeake and Ohio canal, alike indispensable to the national armies, ...
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