8 Upright he rode, and in his silver shield

in > [on]

9 He bore a bloody cross, that quartered all the field."

bloody > blood-red quartered > {Divided into four; a technical term in heraldry} field > {Surface of the shield; another term in heraldry}

201.19

Now by my head (said Guyon) much I muse,
2 How that same knight should do so foule amis,
Or euer gentle Damzell so abuse:
4 For may I boldly say, he surely is
A right good knight, and true of word ywis:
6 I present was, and can it witnesse well,
When armes he swore, and streight did enterpris
8 Th'aduenture of the Errant damozell,
In which he hath great glorie wonne, as I heare tell.

1 "Now by my head," said Guyon, "much I muse

by my head > (An oath) muse > marvel, wonder; am at a loss to understand

2 How that same knight should do so foul amiss,

amiss > [an] evil deed (cf. Hamlet IV v 18)