XL.
Where were th’ avengers then, whose viewless might
Preserved inviolate their awful fane,[28]
When through the steep defiles, to Delphi’s height,
In martial splendour pour’d the Persian’s train?
Then did those mighty and mysterious Powers,
Arm’d with the elements, to vengeance wake,
Call the dread storms to darken round their towers,
Hurl down the rocks, and bid the thunders break;
Till far around, with deep and fearful clang,
Sounds of unearthly war through wild Parnassus rang.