रथोरस्यो हस्तिकक्षोऽश्वपृष्ठोऽरिष्टः ॥ कZ_१०.६.३९ ॥
rathorasyo hastikakṣo 'śvapṛṣṭho 'riṣṭaḥ
The ‘Ariṣṭa’ array has a chariot-breast (front), elephant-flanks, and a cavalry-back (rear).
Elephants provide flank-stability and deterrence against envelopment; they also punish lateral penetrations while the front maintains offensive pressure.