Cniva began the invasion of the
Roman Empire when he crossed the
Danube. He sent detachments throughout the Roman province of
Moesia with forces of Goths and
Sarmatians. His considerable forces demanded the attention of the emperor
Decius. The first column of Cniva's army, a detachment of about 20,000 likely led by the chieftains Argaith and Gunteric, besieged
Marcianopolis, apparently without success. They probably then headed south to besiege Philippopolis (now
Plovdiv in Bulgaria). Cniva's main column under the King himself crossed the Danube at
Oescus then headed eastwards to
Novae, where he was repelled by the provincial governor (and future emperor)
Trebonianus Gallus. The invaders then headed south to plunder
Nicopolis ad Istrum where Decius defeated them but not decisively. After these initial setbacks, the Goths moved southwards through the
Haemus mountain and Decius pursued them (likely through the
Shipka Pass) to save Philippopolis. This time Decius' army was taken by surprise while resting at
Beroe/Augusta Traiana. The Romans were heavily defeated in the ensuing
battle. Decius was forced to withdraw his army to the north at Oescus, leaving Cniva ample time to ravage Moesia and finally capture Philippopolis in the summer of 251, in part with the help of its commander, a certain
Titus Julius Priscus who had proclaimed himself Emperor. It seems that Priscus, after receiving the news of the defeat at Beroe, thought that the Goths would spare him and the city. He was wrong and was probably killed when the city fell. Then the invaders began returning to their homeland, laden with booty and captives, among them many of senatorial rank. The sack of Philippopolis invigorated Decius, who intercepted several parties of Germans, and repaired and strengthened his
fortifications along the Danube, intending to oppose Cniva’s forces. ==Battle of Abritus==