Manusmriti

siva.sh/manusmriti/7/171

यदा मन्येत भावेन हृष्टं पुष्टं बलं स्वकम् । परस्य विपरीतं च तदा यायाद् रिपुं प्रति ॥ १७१ ॥

sanskrit

When he knows his own army to be cheerful in disposition and strong, and (that) of his enemy the reverse, then let him march against his foe.

english translation

yadA manyeta bhAvena hRSTaM puSTaM balaM svakam | parasya viparItaM ca tadA yAyAd ripuM prati || 171 ||

hk transliteration by Sanscript