Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 10 · Yatra and Omens
यात्रा शकुनाश्च
उपैति शांतिं कोपाग्निः शत्रुयोषाश्रुबिंदुभिः ।बलक्षयपक्षदशमीमासीषे विजयाभिधा ॥ ६७५ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 675.
For them, the fire of anger is put out by the tears of the enemies' women. The 10th day of the bright fortnight in the month Isha (Ashvina) is called Vijaya.
Simple meaning: Their anger cools as the enemies' wives weep. The bright 10th day of Ashvina is called Vijaya.
विजयस्तत्र यातॄणां सधिर्वा न पराजयः ।
Marching on Vijaya day brings victory or a truce, never defeat. A glad mind matters more than omens.
तस्मान्मनस्विनां यत्नात्फलहेतुर्मनोदयः ।
A glad mind brings results. Do not set out while a festival, wedding or period of ritual impurity is unfinished.
असमाप्ते न कुर्वीत यात्रां मर्त्यो जिजीविषुः ।
Do not set out during a buffalo-rat fight, a quarrel with your wife or her period.