Easton's Bible Dictionary (1.) Hebrews hishalon i.e., "invention" (as in Ecclesiastes 7:29) contrivances indicating ingenuity. In 2 Chronicles 26:15 it refers to inventions for the purpose of propelling missiles from the walls of a town, such as stones (the Roman balista) and arrows (the catapulta). (2.) Hebrews mechi kobollo, i.e., the beating of that which is in front a battering-ram (Ezek. 26:9), the use of which was common among the Egyptians and the Assyrians. Such an engine is mentioned in the reign of David (2 Samuel 20:15).

Multi-Version Concordance Engines (4 Occurrences) 2 Chronicles 26:15 He made in Jerusalem engines, invented by skillful men, to be on the towers and on the battlements, with which to shoot arrows and great stones. His name spread far abroad; for he was marvelously helped, until he was strong. (WEB KJV JPS ASV WBS NAS RSV) Ezekiel 4:2 And make an attack on it, shutting it in, building strong places against it, and making high an earthwork against it; and put up tents against it, placing engines all round it for smashing down its walls. (BBE) Ezekiel 21:22 At his right hand was the fate of Jerusalem, to give orders for destruction, to send up the war-cry, to put engines of war against the doors, lifting up earthworks, building walls. (BBE) Ezekiel 26:9 He shall set his battering engines against your walls, and with his axes he shall break down your towers. (WEB KJV JPS ASV BBE DBY WBS)