Arthashastra
"दुर्गे हि कोश दण्ड उत्पत्तिर् आपदि स्थानं च जन पदस्य ॥
for it is in fortified towns that the treasury and the army are secured; they (fortified towns) are a secure place for the people.
english translation
"durge hi koza daNDa utpattir Apadi sthAnaM ca jana padasya ॥
hk transliteration by Sanscript