band > attachment; bonds; also, perhaps: company, hence: society

6 Proof be you, Prince, the prowest man alive,

prowest > bravest

7 And noblest born of all in Briton land; 8 Yet you fierce Fortune did so nearly drive,

nearly > closely; particularly drive > (E.g. a game animal into a net, trap, or other confined space where it can be killed)

9 That had not grace you blessed, you should not survive.

grace > favour, goodwill; God's grace blessed > protected from evil, delivered, spared survive > [have survived]

211.31

The Squire arriuing, fiercely in his armes
2 Snatcht first the one, and then the other Iade,
His chiefest lets and authors of his harmes,
4 And them perforce withheld with threatned blade,
Least that his Lord they should behind inuade;
6 The whiles the Prince prickt with reprochfull shame,
As one awakt out of long slombring shade,
8 Reuiuing thought of glorie and of fame,
Vnited all his powres to purge himselfe from blame.

1 The squire, arriving, fiercely in his arms 2 Snatched first the one and then the other jade,