Manusmriti
भिन्द्याच्चैव तडागानि प्राकारपरिखास्तथा । समवस्कन्दयेच्चैनं रात्रौ वित्रासयेत् तथा ॥ १९६ ॥
Likewise let him destroy the tanks, ramparts, and ditches, and let him assail the (foe unawares) and alarm him at night.
english translation
bhindyAccaiva taDAgAni prAkAraparikhAstathA । samavaskandayeccainaM rAtrau vitrAsayet tathA ॥ 196 ॥
hk transliteration by Sanscript