LONDON (Reuters) - A northern English city has found an "incredibly rare" symbol of wartime cowardice. Archivists in the city of Wolverhampton found a white feather -- sent to men accused of cowardice during World War One for not "doing their bit" for the war effort -- along with an anonymous letter addressed to a William Weller and signed "A. Chicken Heart." Weller was a local architect who was excused from military service on medical grounds and because his work in Wolverhampton was vital to the war effort.