Bireme
A bireme is an ancient oared warship with two superimposed rows of oars on each side. Biremes were long vessels built for military purposes and could achieve relatively high speed. They were invented well before the 6th century BC and were used by the Phoenicians, Assyrians, and Greeks.
Description
The name bireme comes from "bi-" meaning two and "-reme" meaning oar.It was typically about long with a maximum beam width of around. It was modified from the penteconter, a ship that had only one set of oars on each side, the bireme having two sets of oars on each side. The bireme was twice the triaconter's length and height, and thus employed 120 rowers. Biremes were galleys, galleasses, dromons, and small pleasure crafts called pamphyles.
The next development, the trireme, keeping the length of the bireme, added a tier to the height, the rowers being thus increased to 180. It also had a large square sail.
Uses
These ships were frequently used by the Romans, as during the second of Caesar's invasions of Britain. The bireme eventually evolved into the trireme. A unit commandant directed a group of marines. The bireme was also recorded in ancient history on the 8th and early 7th-century BC Assyrian reliefs, where they were used to carry out an amphibious attack on the coast of Elam and the lagoons of the Persian Gulf during the reign of Sennacherib.Medieval galleys are also described as "bireme" or "trireme" depending on the number of their banks of oars. The terminology can lead to confusion, since the terms are also used for rowed warships of the Greco-Roman period built on entirely different design principles.