 The crossing of the Danube into Dacia was achieved by the "Imperium Romanum", first in two battles in 102 and then in 106 after the construction of a bridge in 101 near the garrison town of Drobeta at the Iron Gate.This victory over Dacia under Decebalus enabled the Province of Dacia to be created, but in 271 it was lost again.Avars used the river as their southeastern border in the 6th century.