anon > straightway
4 And silver shield: upon his coward breast 5 A bloody cross, and on his craven crest
bloody > blood-red
6 A bunch of hairs discoloured diversely:
hairs > plumes; perhaps horsehair plumes discoloured > varicoloured
7 Full jolly knight he seemed, and well addressed;
Full > Very jolly > gallant; handsome; fine addressed > armed, arrayed
8 And, when he sat upon his courser free,
free > willing
9 Saint George himself you would have deemed him to be.