490 bce
Materials
In September, Greeks win the battle of Marathon largely because Persian arrows fail to penetrate Greek armor. Ten thousand Greeks from a combination of city-states defeat 20,000 Persians loyal to Darius. See also 1346 ce Materials.
TransportationThe astronomer Harpales builds a floating bridge across the Bosporus for the army of Xerxes of Persia using 674 ships as its pontoons, all laced together with flaxen cables. The army successfully marches across the strait, but is defeated by the Greeks. See also 512 bce Construction.






