Thirukkural

ஆற்று பவர்க்கும் அரண்பொருள் அஞ்சித்தற் போற்று பவர்க்கும் பொருள்.

Aatru Pavarkkum Aranporul Anjiththar Potru Pavarkkum Porul

A fort is an object of importance to those who march (against their foes) as well as to those who through fear (of pursuers) would seek it for shelter