चत्वारो दुर्जयः ॥ कZ_१०.६.२२ ॥
catvāro durjayaḥ
Empat daṇḍa membentuk formasi “Durjaya” (Sukar Ditakluki).
Redundancy and depth: multiple mutually supporting units reduce single-point failure—an administrative logic applied to battlefield organization.