Statistics for occurrence #1 of “Southwest” in chapter 10 of Admiral David D. Porter, The Naval History of the Civil War.:

...l attempts were made to get her head up stream (which could easily have been done by letting go an anchor). The vain efforts continued until the steamships had drifted a mile and a half down the Southwest Pass, when they were discontinued, the helm put up, and the vessel headed towards Pilottown, where her commander thought he would be able to turn round! When she arrived at Pilottown she still dr...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Southwest (Indiana, United States) 58 4 0 0 0 user votes
Southwest (Pennsylvania, United States) 42 0 0 0 0 user votes
Southwest (North Carolina, United States) 36 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.