Two Silver-Haired Chiefs Parley

From C3.28, Gudarz and Piran Choose the Warriors. It illustrates C3.28.17–28 (to C3.28.32):

C3.28.17
Gudarz heard, seeing how the turning skyHad darkened all the hope in Piran’s eye.
C3.28.18
He praised the Omnipotent with heart and tongue,Then called to mind the Shah, heroic, young.
C3.28.19
He answered: “Famous chief, I heard it all,And now shall answer plainly to your call.
C3.28.20
What gain did Siavash’s blood provideFor Afrasiab? Let justice be your guide.
C3.28.21
Like sheep they slew him, severing his head,His heart was blood, his wounded spirit bled.
C3.28.22
Thereafter Afrasiab made Iran cryWith raids and slaughter cast beneath the sky.
C3.28.23
Siavash trusted in the oath you swore;You cast his life away and thought no more.
C3.28.24
Then when my son approached with words of peace,You chose the sword and bade all parleys cease.
C3.28.25
In fiery haste you armed your men to fight,And barred the road to peace with all your might.
C3.28.26
My prayer to Him who rules the world and skyHas risen true and secretly on high:
C3.28.27
That I might meet you one day, blade to blade;Now you have come; let us not be delayed.
C3.28.28
So let us two, with silvered heads, contendUpon this field, and bring the quarrel’s end.