Statistics for occurrence #1 of “Lieutenant Rosencranz” in chapter 2.8 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.:

... strategy of the war. Seated in the center is Count Zeppelin, of the Prussian Army, later the winner of honors with his airship and then on a visit to America to observe the Civil War. To his left is Lieutenant Rosencranz , a Swedish officer, on leave of absence, observing the war at close range as General McClellan's personal aide-de-camp. He successively served Burnside, Hooker and Meade in the same capacity. His...
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