Statistics for occurrence #1 of “Doubleday” in chapter 4.38 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 3.:

...y the Heidlersburg road, and Howard called on Sickles at Emmitsburg and Slocum at Two Taverns for aid, to which both these officers promptly responded. It was now no longer a question of prolonging Doubleday 's line, but of protecting it against Ewell whilst engaged in front with Hill. Schurz's two divisions, hardly 6000 effectives, accordingly formed line on the open plain half a mile north of the town...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Abner Doubleday 744 65 40 5 0 user votes
Doubleday 491 0 91 0 0 user votes
A. Doubleday 101 0 1 0 0 user votes
Gen Doubleday 10 0 0 0 0 user votes
U. Doubleday 8 0 0 0 0 user votes
Arthur Doubleday 5 0 1 0 0 user votes
W. F. Doubleday 3 0 1 0 0 user votes
Abna Doubleday 2 0 0 0 0 user votes
Ulysses Doubleday 2 0 2 0 0 user votes
— Doubleday 2 0 0 0 0 user votes
Charles Doubleday 1 0 1 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.