During his brief reign, Decius engaged in important operations against the Goths, who crossed the Danube to raid districts of Moesia and Thrace. This is the first considerable occasion the Goths — who would later come to play such an important role — appear in the historical record. The Goths under King Cniva were surprised by the emperor while besieging Nicopolis on the Danube; the Goths fled through the difficult terrain of the Balkans, but then doubled back and surprised the Romans near Beroë (modern Stara Zagora), sacking their camp and dispersing the Roman troops. It was the first time a Roman emperor fled in the face of Barbarians. The Goths then moved to attack Philippopolis (modern Plovdiv), which fell into their hands. Allegedly, they treated the city conquered with frightful cruelty. The city's commander, Titus Julius Priscus, declared himself Emperor under Gothic protection.
The siege of Philippopolis had so exhausted the numbers and resources of the Goths that they offered to surrender their booty and prisoners, on condition of being allowed to retire unmolested. But Decius, who had succeeded in surrounding them and hoped to cut off their retreat, refused to entertain their proposals. The final engagement, in which the Goths fought with the courage of despair, under the command of Cniva, took place during the second week of June 251 on swampy ground in the Dobrudja near the small settlement of Abritum or Forum Terebronii (modern Razgrad): see Battle of Abrittus. Jordanes records that Decius' son Herennius Etruscus was killed by an arrow early in the battle, and to cheer his men Decius exclaimed, "Let no one mourn; the death of one soldier is not a great loss to the republic." However, his army was annihilated in this battle, and Decius slain. He became the first Roman emperor killed in a battle with barbarians.
