This long barrow is now unique in Dorset as being the only long barrow not sited on the chalk downland. Another long barrow, now sadly destroyed, was in existence at Holdenhurst in Bournemouth. The destroyed barrow was excavated by Stuart Piggott in the thirties, this was the first time a mechanical digger is known to have been used in an archaeological dig.
Longbury has been excavated at least three times, in 1802 when skeletons were found, 1855 sherds of a “very rude vessel” and lastly in 1951 – 4 when a secondary burial and a crouched interment were discovered. The finds from this dig are on view in Gillingham museum.