George Thomas Clark, Mediæval Military Architecture in England…
“ Beyond the ditch is a broad and comparatively level annular area, sloping slightly from the centre, and in its turn girdled by a second and still more formidable ditch. Of this the counterscarp is a steep bank, outside of and beyond which is the natural slope of the base of the hill, forming what, in military phrase, would be the glacis of the place, and which, on three sides, descends into the ordinary valleys of the district, but to the west is continued downwards until it dies into the meads of Stratford, rendered bright and well wooded by the fertilising waters of the Avon. ”
