Ordered , first. That on Monday, the 5th day of September, commencing at the hour of 12 o'clock noon, there shall be given a salute of 100 guns at the arsenal and navy-yard at Washington, and on Tuesday, the 6th of September, or on the day after the receipt of this order, at each arsenal and navy-yard in the United States, for the recent brilliant achievements of the fleet and land forces of the United States in the harbor of Mobile and in the reduction of Fort Powell, Fort Gaines, and Fort Morgan. The Secretary of War and Secretary of the Navy will issue the necessary directions in their respective Departments for the execution of this order.
Second. That on Wednesday, the 7th day of September, commencing at the hour of 12 o'clock noon, there shall be fired a salute of 100 guns at the arsenal at Washington, and at New York, Boston, Philadelphia, Baltimore, Pittsburg, Newport, Ky., and St. Louis, and at New Orleans, Mobile, Pensacola, Hilton Head, and New Berne the day after the receipt of this order, for the brilliant achievements of the army under command of Major-General Sherman in the State of Georgia and the capture of Atlanta. The Secretary of War will issue directions for the execution of this order.
Abraham Lincoln, Executive Order Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/202569