Can anyone lend me any history on the flag. Mine is a U.S. Army garrison flag flown over a fort in the west during the time period 1866-77. I am trying to gather as much information as possible on it as I plan to offer it for presentation at special events and would like to have some detail as to its history. Size is approx. 4 x 12 ft. and has a readable stamp of the manufacturer of "U.S. Bunting" Lowell, Mass.