always > always; perhaps also: all ways [in all directions, round and round] iron wings > (Cf. 111.31:9)
3 And after him owls and night-ravens flew,
owls > (To the Romans, the owl was an omen of death: see Met. 10.453; see also 105.30:6, etc.) night-raven > {An unspecified nocturnal bird, perhaps the nightjar or the night-heron. See SC, gloss to "June"}
4 The hateful messengers of heavy things,
heavy > distressing, grievous; grave
5 Of death and dolour telling sad tidings;
dolour > dolour; physical suffering; grief
6 While sad Celeno, sitting on a cliff,
Celeno > (One of the harpies, vultures with the head and breasts of a woman; associated with greed. The others were Ocypeta and A{e"}llo. See Aen. 3.219 ff.)
7 A song of bale and bitter sorrow sings,