Statistics for occurrence #1 of “The Potomac” in chapter 4 of Admiral David D. Porter, The Naval History of the Civil War.:

...a fell purpose which would not be appeased until the whole land was saturated with blood and sorrow walked over the battle-fields where friends and foes lay mingled together in the arms of death. The Potomac naturally became the first theatre of war as regards the Navy, for the Department at that moment had no ships with which to operate elsewhere, and some small affairs which took place on the river ros...
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