Khoshnavaz Digs the Hidden Trench

From D11.3.3, Khoshnavaz’s Letter to Pirooz. It illustrates D11.3.3.39–45:

D11.3.3.39
When Khoshnavaz heard this, he turned in prayer,And sought from God His shelter and His care:
D11.3.3.40
“O Judge whose judgments guard the cause of right,O Master of the dust and wind in flight,
D11.3.3.41
You know Pirooz, unjust in word and aim,Has no more prowess than Bahram could claim.
D11.3.3.42
He speaks unjustly, eager to extendHis realm by sword and make new kingdoms bend.
D11.3.3.43
Break from the earth the footing where he stands;Leave strength, wit, courage empty in his hands.”
D11.3.3.44
Around his troops he dug a trench and laidA covering across the breach he made.
D11.3.3.45
More than a kamand’s length the trench ran deep;Full twenty arash spanned its sides so steep.