त्रीण्याद्यान्याश्रितास्त्वेषां मृगगर्ताश्रयाप्चराः । त्रीण्युत्तराणि क्रमशः प्लवङ्गमनरामराः ॥ ७२ ॥
The first three of those (various kinds of fortresses) are inhabited by wild beasts, animals living in holes and aquatic animals, the last three by monkeys, men, and gods respectively.
As enemies do not hurt these (beings, when they are) sheltered by (their) fortresses, even so foes (can) not injure a king who has taken refuge in his fort.
One bowman, placed on a rampart, is a match in battle for one hundred (foes), one hundred for ten thousand; hence it is prescribed (in the Sastras that a king will posses) a fortress.
Let that (fort) be well supplied with weapons, money, grain and beasts of burden, with Brahmanas, with artisans, with engines, with fodder, and with water.