Statistics for occurrence #1 of “Gaines' Mill” in chapter 6, page 158 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.:

... 1st MarylandGettysburgJohnson's4005214048.0 8th MississippiStone's RiverJackson's2822011347.1 32d VirginiaAntietamMcLaws'158155745.5 18th MississippiAntietamMcLaws'186107344.6 14th South Carolina Gaines' Mill A. P. Hill's5001819743.0 33d North CarolinaChancellorsvilleA. P. Hill's4803216741.4 5th AlabamaMalvern HillD. H. Hill's225266640.8
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† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.