8 Even stout Sansfoy (O who can then refrain?),

Even > To wit; that is; no less than refrain > restrain oneself [from anger, desire for revenge]

9 Whose shield he bears reversed, the more to heap disdain.

reversed > upside-down (symbolizing ignominious defeat)

104.42

And to augment the glorie of his guile,
2 His dearest loue the faire Fidessa loe
Is there possessed of the traytour vile,
4 Who reapes the haruest sowen by his foe,
Sowen in bloudy field, and bought with woe:
6 That brothers hand shall dearely well requight
So be, {o^} Queene, you equall fauour showe.
8 Him litle answerd th'angry Elfin knight;
He neuer meant with words, but swords to plead his right.

1 "And, to augment the glory of his guile,

glory > [boastful spirit]

2 His dearest love, the fair Fidessa, lo 3 Is there possessed of the traitor vile,

of > by