पूर्वं पूर्वं चैषां श्रेयः सम्नाहयितुम् ॥ कZ_०९.२.१३ ॥
pūrvaṃ pūrvaṃ caiṣāṃ śreyaḥ samnāhayitum |
It is better to prepare these forces in the earlier-to-earlier order (i.e., prioritize the earlier-mentioned categories first).
A ranked preference list: when resources are limited, the state should first prepare the most reliable/advantageous force-type before turning to the next.