stead > place; hence: seat

6 Would have cast down, and trod in dirty mire, 7 Had not the giant soon her succoured;

soon > immediately

8 Who, all enraged with smart and frantic ire,

smart > acute pain

9 Came hurtling in full fierce, and forced the knight retire.

hurtling > rushing full > exceedingly retire > [to retire]

108.18

The force, which wont in two to be disperst,
2 In one alone left hand he now vnites,
Which is through rage more strong then both were erst;
4 With which his hideous club aloft he dites,
And at his foe with furious rigour smites,
6 That strongest Oake might seeme to ouerthrow:
The stroke vpon his shield so heauie lites,
8 That to the ground it doubleth him full +low+
What mortall wight could euer beare so monstrous blow?

8 low > lowe, 1609