There was a "mass issue" of battleflags to the "Confederate Army of the Potomac" (as they were called at the time) in Centerville, VA during the last week of November 1861 extending into December of '61. Most of Jackson's units should have recieved silk battleflags at that time. There may have been a few units carrying 1st Nationals and/or state flags, but, by and large, most of them would have carried the silk battle flags. I know of several that still exist. The 15th Alabama's flag is in the Alabama Dept. of Archives & History in Montgomery, AL, and the 16th Mississippi's is in the Old Capitol Museum in Jackson, MS.