'Steel' in the Bible

The shields of his soldiers [of Media and Babylon] are colored red;The warriors are dressed in scarlet.The chariots blaze with fire of [flashing] steelWhen he is prepared to march,And the cypress spears are brandished [for battle].

The chariots race madly in the streets;They rush wildly in the broad plazas.Their appearance is like torches;They rush in various directions like forked lightning.