Arthashastra
लुब्धक व्यञ्जना वा अवस्कन्द संकुलेषु गूढ युद्ध हेतुभिर् अभिहन्युः ॥
or spies, under the guise of hunters, may slay the king when he is directing his attack, or in the tumult of attack following the plan of treacherous fights.
english translation
lubdhaka vyaJjanA vA avaskanda saMkuleSu gUDha yuddha hetubhir abhihanyuH ॥
hk transliteration by Sanscript