Noun
English Wikipedia has an article on:helepolisWikipedia
helepolis (plural helepolises or helepoleis)
an ancient Greek siege engine consisting of a wheeled tower containing machines for throwing stones and spears
History A Helepolis -like Siege Engine showing ballistae, stairs and movement capstan Modern armoured fighting vehicles are the realization of an ancient concept: that of providing troops with mobile protection and suppressive firepower. Source: Internet