So there is no chance at all that the yellow flag the veterans talked about came to them in the mid-1880s when the US Army regulations changed the regimental flags from blue to yellow for US Cavalry units????????

Additionally, cavalry units, by regulation carried only one regimental banner and then troop banners. This pre-dates the Civil War and was not altered in any regulations that I have found. The only exceptions were for the infantry regiments which, in the 1861 regulations, were ordered to carry two flags - the National colors and the blue regimental colors.

Greg Biggs