2. grace: assurance of favor.
3. terms of love: expressions of friendship.
5. Misuse the tenor of thy kinsman's trust: i.e., Would you abuse Hotspur's confidence in you (by concealing the generosity of my offer, in your role as emissary)?
10. intelligence: information, report.
12. patiently: tranquilly.
15. pause upon: reflect about.
20. Upon the foot of fear: fleeing in terror.
21-22. falling from a hill, he was so bruised / That the pursuers took him: According to Holinshed (Bullough, IV, 191), "the earle of Dowglas, for hast, falling from the crag of an hie mounteine, brake one of his cullions [testicles], and was taken, and for his valiantnesse, of the king frankelie and freelie delivered."
24. dispose of him: decide what to do with him.
26. honourable bounty: gracious assignment, the honor of this bounteous act.
27. deliver: release.
29. crests: i.e., helmets.
33. give away: pass along; i.e., inform Douglas of.
34. power: army.
36. bend you: direct your course. dearest: most zealous, most urgent.
43. fair: successfully.
44. leave: leave off.