of the entrance, which is 6 feet wide in the narrowest part, and 16 in
the widest, where the walls diverge and are rounded off on either side.
The space within the fortress is about 175 feet in diameter. The
Herefordshire Beacon on the Malvern Hills is a fine example of a
triple-ramparted Celtic camp.

[Illustration: PLAN AND SECTION OF CHUN CASTLE]

In Berkshire we have the well-known Whittenham Clumps, the Sinodun
of the Celts, on the summit of which there is a famous camp, with a
triple line of entrenchment, the mound and ditch being complete. The
circumference of the fortress is over a mile. Berkshire and Oxfordshire
are very rich in these camps and earthworks, which guard the course of
the old British road called the Iknield Way. Hill-forts crown the tops
of the hills; and the camps of Blewberry, Scutchamore Knob (a corruption
of Cwichelm's law), Letcombe, Uffington, and Liddington, command the
ancient trackway and bid defiance to approaching foes.

The object of these camps was to provide places of refuge, whither the
tribe could retire when threatened by the advent of its enemy. The Celts
were a pastoral people; and their flocks grazed on the downs and
hillsides. When their scouts brought news of the approach of a hostile
force, some signal would be given by the blowing of a horn, and the
people would at once flee to their fortress driving their cattle before
them, and awaiting there the advent of their foes.

At Uffington there is a remarkable relic of British times called the
Blowing Stone, or King Alfred's Bugle-horn, which was doubtless used by
the Celtic tribes for signalling purposes; and when its deep low note
was heard on the hillside the tribe would rush to the protecting shelter