Statistics for occurrence #1 of “Gettysburg” in chapter 7, page 200 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 10: The Armies and the Leaders.:

...e Fifth Army Corps, and in January, 1863, became chief topographical engineer, and, later, chief engineer of the Army of the Potomac. His service to the Union cause in defending Little Round Top at Gettysburg won him a brevet of colonel in the regular army. For a short time after Gettysburg he was in command of the Second Corps, and from March, 1864, to April, 1865, of the Fifth Corps, Army of the Potom...
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Entity Corpus Doc Corpus Doc  
Gettysburg (Pennsylvania, United States) 7,452 188 1,368 2 0 user votes
Gettysburg (South Carolina, United States) 0 0 0 0 0 user votes
Gettysburg (South Dakota, United States) 0 0 0 0 0 user votes

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