Statistics for occurrence #1 of “Ga.” in chapter 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 10: The Armies and the Leaders.:

...s the case with the Confederates at Sharpsburg and Gettysburg, the losses on both sides are to be counted as fighting losses, and their percentage is a fair measure of capacity to stand pounding. Ga. ed, then, by this standard, which for large armies in a great battle is absolutely fair, Waterloo is eclipsed by Gettysburg; Gettysburg is eclipsed by Sharpsburg, and Sharpsburg eclipsed by Chickamaug...
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