Statistics for occurrence #1 of “Gaines' Mill” in chapter 12 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:

...ed that it was an excellent structure, capable of bearing all arms and affording direct communication, in place of that by the inconvenient roads across the pontoon bridges. At Mechanicsville and Gaines' Mill , the engineer troops did valiant service in the construction of trenches and other field-works. By this time the other troops were gaining the necessary experience, and toward the end of the Penins...
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