Statistics for occurrence #1 of “General Fitz John Porter” in chapter 5.19 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.:

...early in June, 1869, as a means of communication between the divided wings of McClellan's army on the Chickahominy that it would be of incalculable service during battle. When the right wing, under General Fitz John Porter , was engaged on the field of Gaines' Mill against almost the entire army of Lee, across this bridge the division of General Slocum marched from its position in the trenches in front of Richmond on th...
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