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

...r 30, 1861 Sir:I congratulate you on your safe arrival, and especially do I congratulate you on the great public service you have rendered the Union in the capture of the rebel commissioners. Messrs. Mason and Slidell have been conspicuous in the conspiracy to dissolve the Union, and it is well known that when seized by you they were on a mission hostile to the Government and the country. Your cond...
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