brethren giants > [hands]

7 The walls so stoutly with their sturdy main,

stoutly > bravely, resolutely sturdy > courageous main > strength, power (with a pun on the French main, "hand")

8 That never entrance any dared pretend,

That > [So that] pretend > presume, intend; attempt

9 But they to direful death their groaning ghosts did send.

their > [of those who dared pretend entrance] ghosts > souls

211.16

The noble virgin, Ladie of +the+ place,
2 Was much dismayed with that dreadfull sight:
For neuer was she in so euill cace,
4 Till that the Prince seeing her wofull plight,
Gan her recomfort from so sad affright,
6 Offring his seruice, and his dearest life
For her defence, against that Carle to fight,
8 Which was their chiefe and th'author of that strife:
She him remercied as the Patrone of her life.

1 the > that 1609