In May of 101, Trajan launched his first campaign into the Dacian kingdom, crossing to the northern bank of the Danube and defeating the Dacian army at Tapae (see Second Battle of Tapae), near the Iron Gates of Transylvania. It was not a decisive victory, however. Trajan's troops took heavy losses in the encounter, and he put off further campaigning for the year in order to regroup and reinforce his army.