Arthashastra
शिला शस्त्र वर्षम् उत्तम आगारात्, कपाटम् अवपातितं वा, भित्ति प्रणिहितम् एक देश बद्धं वा परिघं मोक्षयेत् ॥
stones and weapons may be showered over his head from the topmost storey; or a door-panel may be let to fall; or a huge rod kept over a wall or partly attached to a wall may be made to fall over him.
english translation
zilA zastra varSam uttama AgArAt, kapATam avapAtitaM vA, bhitti praNihitam eka deza baddhaM vA parighaM mokSayet ॥
hk transliteration by Sanscript