According to Cassius Dio, Bato the Daesitiate went east to the other Bato and made an alliance with him. This contrasts with the picture given by Velleius Paterculus, in which the rebellion seemed to have a plan and the Dalmatians and the Breuci seemed to have acted in concert from the beginning. In Dio's account the two Batos occupied Mount Alma (Mount Fruška Gora, Serbia, just north of Sirmium); here they were defeated by the Thracian cavalry of Rhoemetalces (the king of the Odrysian Kingdom in Thrace, an ally of the Romans) which had been sent ahead against them by Caecina Severus, the governor of Moesia. They then fought hard against Severus, who later went back to Moesia because the Dacians and Sarmatians had crossed the Danube and were ravaging it. Tiberius and Valerius Messallinus lingered in Siscia (Sisak, in present-day central Croatia, the headquarters of the Roman army). The Dalmatians overran the territory of the Roman allies and drew many more tribes into the revolt. Tiberius marched on them, but they avoided pitched battles and kept moving around, causing great devastation. In the winter the rebels invaded Macedonia again. Cassius Dio wrote that they did so again even though he had not mentioned a previous invasion of Macedonia. Modern scholars know about this through the writing of Velleius Paterculus (as noted above). They were defeated by Rhoemetalces and his brother Rhascyporis. Dio did not mention any action by the Romans there. Therefore, it is unknown how the Roman governor of this province dealt with the situation; it is also unknown how the previous invasion was dealt with. It might have involved raids, rather than an occupation.