अट्टालकप्रतोलीमध्ये त्रिधानुष्काधिष्ठानं सापिधानच्छिद्रफलकसंहतमिन्द्रकोशं कारयेत् ॥ कZ_०२.३.१२ ॥
aṭṭālakapratolīmadhye tridhānuṣkādhiṣṭhānaṃ sāpidhānacchidraphalakasaṃhatam indrakośaṃ kārayet
Within the tower–gatehouse complex he should construct an ‘indrakośa’ (a protected enclosure/boxwork), with firing stations for three bowmen, formed of closely joined panels fitted with closable apertures.
It standardizes manning requirements and ensures the gate complex has a minimum built-in defensive capability independent of ad hoc troop availability.