Valmiki Ramayana 6.109.1
ततः प्रवृत्तं सुक्रूरं रामरावणयोस्तदा ।सुमहद्द्वैरथं युद्धं सर्वलोकभयावहम्॥
tataḥ pravṛttaṃ sukrūraṃ rāmarāvaṇayostadā |sumahaddvairathaṃ yuddhaṃ sarvalokabhayāvaham ||
Our plain-language meaning of this verse is waiting for scholar review.
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