train > assembly; entourage
5 With the darts which his right hand did strain,
darts > arrows strain > clasp tightly
6 Full dreadfully he shook (that all did quake)
shook > (This could be glossed as "brandished", taking "the darts" to be its object, and "With that" to mean "Whereupon") that > [so that]
7 And clapped on high his coloured wings twain,
twain > two
8 That all his many it afraid did make:
That > [So that] many > meinie: company
9 Tho blinding him again, his way he forth did take.