Dr Jane Kershaw from Oxford University, who is leading the dig, said it may have been used by the famous commander Halfdan to launch attacks on the Picts.A number of objects have been found there over the years, using metal detectors, such as lead gaming pieces and copper coins known as stycas.'Incredible finds'Volunteers are also working at the field, which Dr Kershaw believes could have been home to a "town of tents" in the 9th Century."They found some incredible finds that can really only belong to the Viking Great Army and their activities in the 870s ," Dr Kershaw told...