End2End (and back again) with Mountbatten 22 September 2019 Save the date. Registrations open online in early July. From Culver Down in the East to The Needles Battery in the West, navigate your way along an off-road and on-road route, across the Island's stunning countryside and demanding terrain. Or choose to do either half of the route from Culver to Gatcombe. With a choice of three distances, from 23km to a whopping 92km, this is Mountbatten's toughest challenge event!