with > by
3 Eftsoons he began to rage, and inly fret,
Eftsoons > Thereupon inly > inwardly fret > fret; gnaw upon himself
4 Crying, "Let be that lady debonair,
debonair > gracious; meek, gentle
5 You recreant knight, and soon yourself prepare
recreant > cowardly, apostate (cf. 104.41:4) soon > without delay
6 To battle, if you mean her love to gain:
mean > intend
7 Lo, lo already, how the fowls in air 8 Do flock, awaiting shortly to obtain 9 Your carcase for their prey, the guerdon of your pain.