Statistics for occurrence #1 of “Fort Sumter” in chapter 6 of John G. Nicolay, The Outbreak of Rebellion:

...em an official communication, drafted by President Lincoln. It ran as follows: I am directed by the President of the United States to notify you to expect an attempt will be made to supply Fort Sumter with provisions only, and that if such attempt be not resisted, no effort to throw in provisions, arms, or ammunition will be made without further notice, or in case of an attack upon the fort. ...
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