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May 1864. "North Anna River, Virginia. Pontoon bridge across North Anna below railroad bridge where a portion of the 2nd Corps under Gen. Hancock crossed, May 23d." Wet plate glass negative by Timothy H. O'Sullivan. View full size.
The fifth man from the left side of the photo standing on the bridge (wearing a 9-button shell jacket) clearly has a 2nd Corps badge on his forage cap. This was a trefoil as depicted below:

The man on the right appears to be fishing. Soldiers always complain about the food in the mess hall.
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