दण्डान्तरा द्विदण्डान्तरा वा चर्याः कारयेत् अग्राह्ये देशे प्रधावनिकां निष्किरद्वारं च ॥ कZ_०२.३.१४ ॥
daṇḍāntarā dvidaṇḍāntarā vā caryāḥ kārayet agrāhye deśe pradhāvanikāṃ niṣkiradvāraṃ ca
He should lay out patrol-walks at intervals of one daṇḍa or two daṇḍas; and in terrain difficult to approach or seize he should also make a sprint-way (pradhāvanikā) and a sally-port (niṣkiradvāra).
It enables controlled offensive sorties, reconnaissance, and emergency evacuation without exposing the main gate to surprise or sabotage.