Kural - 498

If lord of army vast the safe retreat assail
Of him whose host is small, his mightiest efforts fail

Explanation
The power of one who has a large army will perish, if he goes into ground where only a small army can act.

Tamil Transliteration
Sirupataiyaan Sellitam Serin Urupataiyaan
Ookkam Azhindhu Vitum.