Hello guys. I saw this same flag at the 150th Chancellorsville and again at this years 150th Wilderness/Spotsylvania event. The even had a smaller guidon in the same pattern. I could never find them in camp to inquire about the flag. McClellan used some flags of this pattern with different color combinations and numbers in the white bar. But this flag that Johnny is questioning belonged to a Confederate unit. I posted about this several months ago.
Keith