I can't fit the entire photo on my computer screen (unless it's really small) and the USAHEC won't let me download anything larger than a thumbnail size photo. But I came up with this.
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Col. Harry Stanton Burton (1819-1869)mis second man over from Meade's right? Edit: I know Marsena Patrick's name is there.
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His shoulder strap looks like it has a bar like 1st Lt. Looks like something in the middle, also. A colonel is the only one with a design in the middle of the strap. Double edit: The more I look at the photo the more he looks like Marsena Patrick (1811-1888).