Statistics for occurrence #1 of “Messrs. Eustis” in chapter 7 of Admiral David D. Porter, The Naval History of the Civil War.:

... Messrs. Mason and Slidell, formerly members of the U. S. Senate, who were now bound to Europe as commissioners from the Confederate Government to the Courts of England and France; the other two were Messrs. Eustis and McFarland, attaches to the commissioners. The Trent was one of a line of British steamers which ran regularly between Vera Cruz and Havana, thence to St. Thomas, and from there to England. ...
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