285 As raised has poor pastor's oaten reed

pastor's > shepherd's oaten reed > (Of which shepherds' pipe were supposedly made)

286 From rustic tunes to chant heroic deeds. 287 288 So might your Redcross Knight with happy hand

happy > fortunate

289 victorious be in that fair island's right:

that fair island > [Britain]

290 Which you do veil in type of Faery Land, 291 Eliza's blessed field, that Albion hight,

Eliza > [Elizabeth]
hight > is called

292 That shields her friends, and wars her mighty foes,

wars > [wages war upon]