The Helmet of Peretu, a Geto-Dacian silver helmet dating from the century BC. It was found in the Peretu area, Romania. Courtesy currently located at the Romanian National History Museum. Photo taken by Cristian Chirita
A 2nd century Dacian chieftain would wear a bronze Phrygian type helmet, a corselet of iron scale armor, an oval wooden shield with motifs and wield a sword. https://en.wikipedia.org/wiki/Dacian_warfare
Alexander then marched for three days to the Danube, encountering the Getae tribe on the opposite shore. Crossing the river at night, he surprised them and forced their army to retreat after the first cavalry skirmish.