No More Learning

XLIII
This man began with wondrous art to make,
Not rams, not mighty brakes, not slings alone,
          the firm and solid walls to shake,
To cast a dart, or throw a shaft or stone;
But framed of pines and firs, did undertake
To build a fortress huge, to which was none
Yet ever like, whereof he clothed the sides
Against the balls of fire with raw bull's hides.