 Towards the end of the year, additional reinforcements arrived; three legions from Moesia commanded by Aulus Caecina Severus, and two legions with Thracian cavalry and auxiliary troops from Anatolia commanded by Silvanus.By the time Germanicus had arrived in Pannonia, the rebels had resorted to raiding from the mountain fortresses to which they had withdrawn.Because the Roman legions were not so effective at countering this tactic, Tiberius deployed his auxiliary forces and divided his army into small detachments, allowing them to cover more ground and conduct a war of attrition against the rebels in their strong defensive positions.