Engine. A term applied exclusively to military affairs in the Bible. The engines to which the term is applied in 2 Chronicles 26:15, were designed to propel various missiles from the walls of the besieged town. One, with which the Hebrews were acquainted, was the battering-ram, described in Ezekiel 26:9 and still more precisely in Ezekiel 4:2; Ezekiel 21:22.