Arthashastra
सामन्त आदीनाम् अन्यतमं वा अस्य दुर्गे स्थापयित्वा अपगच्छेत् ॥
or having installed in the king's fort any one of the neighbouring kings, he may withdraw himself.
english translation
sAmanta AdInAm anyatamaM vA asya durge sthApayitvA apagacchet ॥
hk transliteration by Sanscript