2 Was for like need enforced to disarray:
like > [a] similar disarray > disrobe, divest herself [of armour]
3 Tho, when vailed was her lofty crest,
Tho > Then vailed > lowered; doffed crest > helmet
4 Her golden locks, that were in trammels gay
trammels > plaits, braids
5 Upbound, did themselves adown display,
adown > down display > spread, spread out; display
6 And raught to her heels: like sunny beams
raught > reached