Battle of Sarmisegetusa

Due to the threat the Dacians represented to the Roman Empire's eastward expansion, in the year 101 Emperor Trajan made the decision to begin a campaign against them. The first conflict began on March 25 and the Roman troops, consisting of four principal legions, the units X Gemina, XI Claudia, II Traiana Fortis and XXX Ulpia Victrix, defeated the Dacians, and it thus ended in Roman victory. https://en.wikipedia.org/wiki/Battle_of_Sarmisegetusa