A surgeon's asst. on a bridge?

I just had to share this. I am studying the 36th Wisconsin Infantry in preparation for a program I am presenting at the Kenosha Civil War Museum. I came across, at the WHS of course, an account from Walter Osgood Hart of the 36th, a surgeon’s assistant. In his section on 2nd Corps(his corps) movement to Deep Botom he offers the following explanation of his being a part of an image that was taken of the Deep Bottom Bridge. I’ve posted what I think is the photo above. Enjoy. NOTE: He calls himself the Plodder.

“That night, just before it began to get dark. Plodder was down by the pontoon bridge. Three or four others were there. A man came with a camera and was looking for a suitable place to stand it. The men talked with him, and he told them he was going to take a picture of the bridge, and they could go down on it and have their pictures taken if they wished. Plodder went with them, and while the others sat in the pontoons, he wanted to have it so that if he ever saw the picture he could recognize himself. He stood alone "in the middle of the —" wagon track. Fifty years later he was spending the evening at a home of his son's parishioners. He was shown a book of Civil War pictures, published by the artist who took them, a friend of the man we were visiting. Naturally he was interested, and eagerly viewed the pictures. In the latter part of the book he came upon a picture of the pontoon bridge across the James River, and there he saw himself standing thus conspicuously. He was sure it was the picture of himself because on his head was the hat he bought when in camp at Madison, Wisconsin. And so, gentle reader, if you ever come across that book, and see that picture you may be sure Plodder was there.”