Statistics for occurrence #1 of “Doubleday, Captain” in page 221 of John G. Nicolay, The Outbreak of Rebellion:

...
Doubleday, Captain (afterward General) Abner, 29, 64 Douglas, Stephen A., adherents of, 8; his interview with President Lincoln, 76 Dogan Heights, 191 Duke, Captain, 117 Dumont, Colonel, 143, 15 ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  

† 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.