कार्ष्णायसतनुत्राणान् नराश्वरथकुञ्जरान्
kārṣṇāyasatanu-trāṇān narāśva-ratha-kuñjarān
Sañjaya said: (They beheld) men, horses, chariots, and elephants protected by iron cuirasses—an image of war’s hardening of bodies and minds, where life is preserved not by compassion but by armor and force.
संजय उवाच
The verse underscores the grim ethic of battlefield survival: protection is sought through material defenses (iron armor) and organized force (men, horses, chariots, elephants). It implicitly contrasts the necessity of martial preparedness with the moral cost of a world where safety depends on weaponry rather than restraint.
Sañjaya is describing the battlefield scene in Drona Parva: the combatants and their war-machines—infantry, cavalry, chariots, and elephants—are arrayed and armored in iron, emphasizing the scale and intensity of the fighting.