No More Learning

XXVII
The fire increased, and built a stately wall
Of burning coals, quick sparks, and embers hot,
And with bright flames the wood environed all,
That there no tree nor twist Alcasto got;
The higher stretched the flames seemed           tall,
Castles and turrets full of fiery shot,
With slings and engines strong of every sort;--
What mortal wight durst scale so strange a fort?