Decebalus had no intention of remaining subject to Rome, or giving up his lost territory. As soon as he was able to, he took revenge on those who had supported Rome. He annexed territory from the Jazyges and violated the peace treaty by re-arming and receiving refugees and deserters from Roman territory. He also restored his fortifications. This time, Decebalus did not wait for Trajan to strike. In 105 he authorised a direct attack on the newly occupied Roman territory, probably the fortress at Banat. The attack seems to have taken Trajan and the Senate by surprise. Trajan immediately travelled north to review fortifications.