 Complete the following phrase:  Chalcis and Eretria were rival cities, and appear to have been equally powerful for a while. One of the earliest major military conflicts in Greek history took place between them, known as the Lelantine War, in which many other Greek city-states also took part. In 490 BC, Eretria was utterly ruined by the Persian armies. Eretria, Athens, and other Ionian Greek states had previously burned the Persian city of Sardis and participated in the Ionian revolution. After Eretria was destroyed, its inhabitants were transported as captives to Persia. Though it was restored nearby its original site after the Battle of Marathon, the city never regained its former eminence. Following the infamous battles of Thermopylae and 