Adjutant and Inspector General Samuel Cooper in General orders No. 3, April 13, 1861, from Montgomery Alabama: In honor of the occasion, officially announced, that the United States colors have been hauled down at Fort Sumter and replaced by the white flag, a salute of fifteen guns will be fired in front of the Department this day at two o'clock.
"By Command of the Secretary of War."
The invention and use of the telegraph gave places far apart near instant news.
Samuel Cooper had also been the Adjutant and Inspector General of the U.S. Army before secession.