Analysis of information sources in references of the Wikipedia article "Decebalus" in Vietnamese language version.
Battle of Sarmizegetusa (Sarmizegetuza), A.D. 105. During Trajan's reign one of the most important Roman successes was the victory over the Dacians. The first important confrontation between the Romans and the Dacians took place in the year 87 and was initiated by Domitian. The praetorian prefect Cornelius led five or six legions across the Danube on a bridge of ships and advanced towards Banat (in Romania). The Romans were surprised by a Dacian attack at Tapae (near the village of Bucova, in Romania). Legion V Alaude was crushed and Cornelius Fuscus was killed. The victorious general was originally known as Diurpaneus (see Manea, p.109), but after this victory he was called Decebalus (the brave one).
In the year 88, the Romans resumed the offensive. The Roman troops were now led by the general Tettius Iulianus. The battle took place again at Tapae but this time the Romans defeated the Dacians. For fear of falling into a trap, Iulianus abandoned his plans of conquering Sarmizegetuza and, at the same time, Decebalus asked for peace. At first, Domitian refused this request, but after he was defeated in a war in Pannonia against the Marcomanni (a Germanic tribe), the emperor was obliged to accept the peace.
However, during the years 103-105, Decebalus did not respect the peace conditions imposed by Trajan and the emperor then decided to destroy completely the Dacian kingdom and to conquer Sarmizegetuza.
Because the Dacians represented an obstacle against Roman expansion in the east, in the year 101 the emperor Trajan decided to begin a new campaign against them. The first war began on 25 March 101 and the Roman troops, consisting of four principal legions (X Gemina, XI Claudia, II Traiana Fortis, and XXX Ulpia Victrix), defeated the Dacians.
