Until recent years, the summit of Dartmoor, composed of the twin peaks called respectively Ygs Tor (2028’) and High Willhays (2039’), has for practical purposes been inaccessible to the public, who could only walk over it - an artillery practice ground - at imminent risk of life and limbo But now that armies, instead of hurling explosive shells at the next mountain, are directing atomic missiles at the continent next-but-one, Dartmoor has ceased to be adequate for artillery practice and is now a National Park.