Mistreated by corrupt local Roman officials, the Gothic refugees were soon experiencing a famine; some are recorded as having being forced to sell their children to Roman slave traders in return for rotten dog meat. Enraged by this treachery, Fritigern unleashed a widescale rebellion in Thrace, in which he was joined not only by Gothic refugees and slaves, but also by disgruntled Roman workers and peasants, and Gothic deserters from the Roman Army. The ensuing conflict, known as the Gothic War, lasted for several years. Meanwhile, a group of Greuthungi, led by the chieftains Alatheus and Saphrax, who were co-regents with Vithericus, son and heir of the Greuthungi king Vithimiris, crossed the Danube without Roman permission. The Gothic War culminated in the Battle of Adrianople in 378, in which the Romans were badly defeated and Valens was killed.