Statistics for occurrence #1 of “Mr. Lincoln” in chapter 57 of Admiral David D. Porter, The Naval History of the Civil War.:

...eing crushed. The negroes, in their ecstasy, could not be made to understand that they were detaining the President, and would not feel that they were free unless they heard it from his own lips. Mr. Lincoln , therefore, made a few remarks, assuring them that they were free and giving them good advice, after which the party managed to move slowly on to the city. Passing the Libby Prison, the President...
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