Statistics for occurrence #1 of “Plank” in chapter 24, page 251 of John Dimitry , A. M., Confederate Military History, a library of Confederate States Military History: Volume 10.1, Louisiana:

... battle swayed during the two days, at times fiercely, with a resolute purpose of the enemy's masses to envelope, anaconda-like, our slenderer lines; at other times, utilizing heavy guns to clear the Plank road of our men. The artillery was specially destructive on Saturday, the 2d. About 9:30 p. m. the head of Nicholls' brigade halted on the Plank road about half a mile from Chancellor's house, and ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Plank (Pennsylvania, United States) 850 8 0 0 0 user votes
Plank (Kentucky, United States) 104 0 0 0 0 user votes

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