Statistics for occurrence #1 of “Lieut. A. J. Slemmer” in chapter 2.6 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 1: The Opening Battles.:

...acks of Company G, 1st U. S. Artillery, 60 men. These retired into Fort Barrancas, after an attack upon that Fort about midnight had been repelled. This was the first fighting of the war. Meanwhile Lieut. A. J. Slemmer , commander at Fort Pickens across the inlet, was removing the Barrancas garrison and their families. He succeeded in getting all safely across in a vessel to Fort Pickens, and the guns of Fort Barr...
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