Sohrab Finds the Fortress Empty

From B8.11, Sohrab Takes the White Fortress. It illustrates B8.11.5–13:

B8.11.5
The gates stood open; Sohrab entered through,No battle-ready warrior met his view.
B8.11.6
His army entered, searching court and hall,But Gazhdaham was nowhere found at all.
B8.11.7
For in the night the fortress chiefs had fled,With Gazhdaham, who rode out at their head.
B8.11.8
A secret passage ran beneath the ground,Unknown to every foe encamped around.
B8.11.9
Both guilty men and those without a stainCame forth to Sohrab, hoping life to gain.
B8.11.10
Each sought some means by which his life might last,And begged for mercy till the danger passed.
B8.11.11
He searched the halls for Gordafarid’s face,But found no sign of her in any place.
B8.11.12
For love and bond had rooted in his heart,And from his thoughts her image would not part.
B8.11.13
“Alas,” he said, “the shining moon is gone;Beneath a cloud her radiant face withdrawn.”