Statistics for occurrence #1 of “Tybee River” in chapter 8 of Admiral David D. Porter, The Naval History of the Civil War.:

...f Dupont's victory. lost opportunities. sea Islands. Congregation of slaves at Hilton Head. entrenchments erected at Hilton Head. General Stevens. Beaufort occupied. reconnoissance up the Tybee River to Fort Pulaski. expedition to Fernandina. commanders of and vessels composing the expedition. capture of the works on Cumberland and Amelia Islands. Fort Clinch occupied. capture of Fernandina....
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Tybee River (Georgia, United States) 73 14 1 0 0 user votes

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