Bijan and Gostaham Break the Ring

From B13.14, The Iranians Make a Night-Attack, Tus, Giv, Rohham Are Surrounded but Are Saved. It illustrates B13.14.49–60:

B13.14.49
“Iran will perish!” Then rose the koust’s sound,With gopal blows from Iran’s waiting ground.
B13.14.50
But Giv and Tus returned not from the plain;Shidush and Gostaham cried out in pain.
B13.14.51
The lion Gostaham said: “Tus too longHas fought where gorz and sword strike fierce and strong.”
B13.14.52
Guraza said to brave Bijan: “Our chiefHas labored long in battle without relief.”
B13.14.53
Then from the plain the koust began to sound;Air darkened, earth grew ebony around.
B13.14.54
The warriors hastened toward Tus’s cry;Blood stained the field beneath the darkening sky.
B13.14.55
They came behind the foe with their gorz raised,And struck with heavy blows as fury blazed.
B13.14.56
Tus knew that help had reached the deadly field,And roared like koust above the sword and shield.
B13.14.57
His rein grew light; the stirrup heavy lay,His fallen fortune rose from low that day.
B13.14.58
Rohham and Giv, who heard Bijan’s brave voice,Became like lions and made hearts rejoice.
B13.14.59
Thus fought they on until the night had fled,When light above the mountains rose and spread.
B13.14.60
Then they recalled their men and drew them back,Toward rocky heights along the mountain-track.