अश्वव्यूहो वर्मिणामुरस्यं शुद्धानां कक्षपक्षाविति ॥ कZ_१०.५.३५ ॥
aśvavyūho varmiṇām urasyaṃ śuddhānāṃ kakṣapakṣāv iti
Dans le déploiement de cavalerie, les cavaliers cuirassés forment la poitrine/le front ; les non cuirassés (ou plus légers) forment les épaules et les ailes.
Armor increases survivability in direct contact, so it is assigned to the most exposed, collision-prone sector.