A road was closed and a cordon was put in place for several hours as the bomb squad investigated an item found in a Mid Sussex field.
Police said a shell was discovered in a field off Ditchling Road at about 5.35pm yesterday evening (April 15).
The road was closed in both directions between Coldean Lane (Old Boat Corner) and Ditchling Beacon Car Park and a 50 metre cordon was put in place in the area.
Officers said the Explosive Ordnance Disposal unit attended at about 7pm. It was confirmed the item was a smoke shell.
The road has since re-opened.