then in the key-hole turns Th’ intricate wards, and every bolt and bar248 Of massy iron or solid rock with ease Unfastens: on a sudden open fly 880 With impetuous recoil and jarring sound Th’ infernal doors, and on their hinges grate Harsh thunder, that the lowest bottom shook Of Erebus. She opened, but to shut249 Excelled her power; the gates wide open stood, 885 That with extended wings a bannered host250 Under spread ensigns marching might pass through
