 The reason used for this campaign was Decebalus' lack of respect for the Romans, and the fact that he failed to respect the agreements of the peace reached following the First Battle of Tapae from 87/88.Beside the nine Roman legions that were already stationed on the Danube frontier, Trajan brought two more, Legio X Gemina and Legio XI Claudia, and created two new legions, Legio II Traiana Fortis and Legio XXX Ulpia Victrix.The Roman army crossed the Danube at Viminacium, slowly making its way into Dacia.