अश्वव्यूहो वर्मिणामुरस्यं शुद्धानां कक्षपक्षाविति ॥ कZ_१०.५.३५ ॥
aśvavyūho varmiṇām urasyaṃ śuddhānāṃ kakṣapakṣāv iti
騎兵陣では、甲冑の騎兵が胸部/前面をなし、非装甲(または軽装)の者が肩と両翼をなす。
Armor increases survivability in direct contact, so it is assigned to the most exposed, collision-prone sector.