3 His face was rugged, and his hoary head
rugged > hairy
4 Dropped with brackish dew; his three-forked pike
Dropped > Sprinkled three-forked pike > [trident]
5 He sternly shook, and therewith fierce did strike
sternly > fiercely; grimly therewith > with it
6 The raging billows, that on every side
that > [so that]
7 They trembling stood, and made a long broad dike, 8 That his swift charet might have passage wide,
That > [So that] charet > chariot