Statistics for occurrence #1 of “Fort Sumter” in chapter 28 of Horace Greeley, The American Conflict: A History of the Great Rebellion in the United States of America, 1860-65: its Causes, Incidents, and Results: Intended to exhibit especially its moral and political phases with the drift and progress of American opinion respecting human slavery from 1776 to the close of the War for the Union. Volume I.:

...lling instructions from my Government, or additional supplies. This answer was judged unsatisfactory; and, at 3:20 A. M., of the 12th, Major Anderson was duly notified that fire would be opened on Fort Sumter in one hour. Punctual to the appointed moment, the roar of a mortar from Sullivan's Island, quickly followed by the rushing shriek of a shell, gave notice to the world that the era of compromise ...
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