An Experiment for a Metre: I heard a voice pealing loud triumph to-day

I heard a voice pealing loud triumph to-day:
The voice of the Triumph, O Freedom, was thine!
Sumptuous Tyranny challeng'd the fray,
'Drunk with Idolatry, drunk with wine.'
Whose could the Triumph be Freedom but thine?
Stars of the Heaven shine to feed thee;
Hush'd are the Whirl-blasts and heed thee;--
By her depth, by her height, Nature swears thou art mine!