hast thou for nought laboured through years uncounted at the building of walls of impregnable thickness and in the making of gates whose valour may not be overthrown ; is the power of the hill amon gwareth become as lowly as the deep vale , or the hoard of weapons that lie upon it and its unnumbered arrows of so little worth that in the hour of peril thou wouldst cast all aside and go naked into the open against enemies of steel and fire , whose trampling shakes the earth and the encircling mountains ring with the clamour of their footsteps ?