sentences:  The entrance is mid-way along the eastern side, defined by a wide break in the main rampart.Trenches dug in the southeast, the entrance, and a few other investigations in 1972-3 revealed that the front of the main rampart had been set against and into the edge of the associated ditch and revetted with massive, irregular blocks of sandstone.The conclusion was that the purpose was to resist sling warfare due to the form and width, with rounded pebbles, foreign to the Greensand Ridge, being frequently found in the areas excavated.