In spring 367, Valens crossed the Danube and attacked the Visigoths under Athanaric, Ermanaric's tributary. The Goths fled into the Carpathian Mountains, and the campaign ended with no decisive conclusion. The following spring, a Danube flood prevented Valens from crossing; instead the Emperor occupied his troops with the construction of fortifications. In 369, Valens crossed again, from Noviodunum, and by devastating the country forced Athanaric into giving battle. Valens was victorious, Athanaric and his forces were able to withdraw in good order and pleaded for peace.