The Romans used a variety of methods to conquer the Celts, including military force, political alliances, and cultural assimilation. The Roman army was one of the most powerful and disciplined military forces in the world at the time, and it was often able to defeat the Celts in battle. The Romans also formed alliances with some Celtic tribes, and they used these alliances to divide and conquer the Celts. Finally, the Romans used cultural assimilation to erode Celtic culture and identity. They introduced Celtic elites to Roman culture and encouraged them to adopt Roman customs and values.
The Roman conquest of Celtic territory had a profound impact on the Celts. It led to the loss of their independence and the decline of their culture. However, the Celts also adopted many Roman customs and values, and they played an important role in the development of Western civilization.