Statistics for occurrence #1 of “Plank” in chapter 4.17 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 4.:

...rrespond with the Orange turnpike, the left with the Orange Plank road. Down the Orange turnpike, on May 5th, Lee sent Ewell against Warren, while two divisions of A. P. Hill advanced by the Orange Plank road to check Hancock. Nearly a day later, Longstreet reached the field on the same road as Hill. The engagements fought on May 5th by Ewell on the Orange turnpike, and by A. P. Hill on the Orang...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Plank (Pennsylvania, United States) 850 80 0 0 0 user votes
Plank (Kentucky, United States) 104 0 0 0 0 user votes

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