I am trying to find an original source for a report by several soldiers of a mysterious black ball about one metre across that rolled uphill. Place: Trundle Hill, Sussex. Date: 1940. The only source I have is an account in a British childrens' annual, Action, for 1983. Similar ghost stories, etc. in these types of annuals are based on known cases, so it is unlikely to be completely made up. Any help with finding a source would be greatly appreciated.