Kautilya's Arthashastra 9.2.3

9.2.3

"prabhūtaṃ me bhṛtabalam alpaṃ ca maulabalamṇ" "parasyālpaṃ viraktaṃ vā maulabalam, phalguprāyam asāraṃ vā bhṛtasainyamṇ" "mantreṇa yoddhavyam alpavyāyāmenaṇ" "hrasvo deśaḥ kālo vā tanukṣayavyayahṇ" "alpāvāpaṃ śāntopajāpaṃ viśvastaṃ vā me sainyamṇ" "parasyālpaḥ prasāro hantavyahṇ" - iti bhṛtabalakālaḥ //

When he thinks that the army he has hired is greater than his hereditary army; that his enemy's hereditary army is small and disaffected, while the army his enemy has hired is insignificant and weak; that actual fight is less than treacherous fight; that the place to be traversed and the time required do not entail much loss; that his own army is little given to stupor, is beyond the fear of intrigue, and is reliable; or that little is the enemy's power which he has to put down, then is the time for leading the hired army.