siege-works

siege-works: ŏpĕra, n. pl.: to invest a place with regular s., (urbem) operibus munitionibusque sepire, Cic. Ph. 13, 9: so, opera et machinae, Liv. 37, 5, extr. If only the engines of attack are meant, machinae (machinationes, also res) oppugnatoriae, cf. Vitr. 10, 12 (18).