Statistics for occurrence #1 of “John Johnson” in chapter 51 of Admiral David D. Porter, The Naval History of the Civil War.:

... L. B. Leland; Acting-Third-Assistant, H. C. Marrow. Acting-Ensign, Philip Sheridan; Acting-Master's Mates, Charles Case, Thomas Power and Louis Reinberg; Engineers: Acting-Second-Assistant, John Johnson ; Acting-Third-Assistant, G. C. Steadman. Acting-Ensign, J. W. Turner; Acting-Master's Mates, David Hall and S. M. Carey; Acting-Second-Assistant Engineer, G. E. Riddle.
...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
† John Johnson 263 14 55 2 0 user votes
Sir John Johnson 2 0 0 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.