While searching through the book Chancellorsville by John Bigelow I found the following on page 376, "The main depot for the army will be designated by a crimson flag 'Ordnance Depot, U. S. A." This was in G.O. No. 30, March 25, 1863. I guess this rescinded McClellan's G.O. No. 102, March 24, 1862 which called for green flags.

Anyone know of an example of one of these crimson flags?

Ed