section_path: Military/Navy
section_name: Navy
paragraph_text: Navy
  
  Since its foundation by Cyrus, the Persian empire had been primarily a land empire with a strong army but void of any actual naval forces. By the 5th century BC, this was to change, as the empire came across Greek and Egyptian forces, each with their own maritime traditions and capabilities. Darius I was the first Achaemenid king to invest in a Persian fleet. Even by then no true "imperial navy" had existed either in Greece or Egypt. Persia would become the first empire, under Darius, to inaugurate and deploy the first regular imperial navy. Despite this achievement, the personnel for the imperial navy would not come from Iran, but were often Phoenicians (mostly from Sidon), Egyptians and Greeks chosen by Darius the Great to operate the empire's combat vessels.
  
  At first the ships were built in Sidon by the Phoenicians; the first Achaemenid ships measured about 40 meters in length and 6 meters in width, able to transport up to 300 Persian troops at any one trip. Soon, other states of the empire were constructing their own ships, each incorporating slight local preferences. The ships eventually found their way to the Persian Gulf and Persian naval forces laid the foundation for a strong Persian maritime presence there. Persians also had ships often of a capacity 100 to 200 troops patrolling the empire's various rivers including the Karun, Tigris and Nile in the west, as well as the Indus.
  
  The Achaemenid navy established bases located along the Karun, and in Bahrain, Oman, and Yemen. The Persian fleet was not only used for peace-keeping purposes along the Karun but also opened the door to trade with India via the Persian Gulf. Darius's navy was in many ways a world power at the time, but it would be Artaxerxes II who in the summer of 397 BC would build a formidable navy, as part of a rearmament which would lead to his decisive victory at Knidos in 394 BC, re-establishing Achaemenid power in Ionia. Artaxerxes II would also use his navy to later on quell a rebellion in Egypt.
  
  The construction material of choice was wood, but some armoured Achaemenid ships had metallic blades on the front, often meant to slice enemy ships using the ship's momentum. Naval ships were also equipped with hooks on the side to grab enemy ships, or to negotiate their position. The ships were propelled by sails or manpower. The ships the Persians created were unique. As far as maritime engagement, the ships were equipped with two mangonels that would launch projectiles such as stones, or flammable substances.
  
  Xenophon describes his eyewitness account of a massive military bridge created by joining 37 Persian ships across the Tigris. The Persians used each boat's buoyancy to support a connected bridge above which supply could be transferred. Herodotus also gives many accounts of the Persians using ships to build bridges.
  
  Darius I, in an attempt to subdue the Scythian horsemen north of the Black Sea, crossed over at the Bosphorus, using an enormous bridge made by connecting Achaemenid boats, then marched up to the Danube, crossing it by means of a second boat bridge. The bridge over the Bosphorus essentially connected the nearest tip of Asia to Europe, encompassing at least some 1000 meters of open water if not more. Herodotus describes the spectacle, and calls it the "bridge of Darius":
  
  Strait called Bosphorus, across which the bridge of Darius had been thrown, is hundred and twenty furlongs in length, reaching from the Euxine, to the Propontis. The Propontis is five hundred furlongs across and fourteen hundred long. Its waters flow into the Hellespont, the length of which is four hundred furlongs...
  
  Years later, a similar boat bridge would be constructed by Xerxes I, in his invasion of Greece. Although the Persians failed to capture the Greek city-states completely, the tradition of maritime involvement was carried down by the Persian kings, most notably Artaxerxes II. Years later, when Alexander invaded Persia and during his advancement into India, he took a page from the Persian art of war, by having Hephaestion and Perdiccas construct a similar boat-bridge at the Indus river in India in the spring of 327 BC.