In 81, Agricola "crossed in the first ship" and defeated peoples unknown to the Romans until then. Tacitus, in Chapter 24 of "Agricola", does not tell us what body of water he crossed. Modern scholarship favours either the Firth of Clyde or Firth of Forth. Tacitus also mentions Hibernia, so southwest Scotland is perhaps to be preferred. The text of the "Agricola" has been amended here to record the Romans "crossing into trackless wastes", referring to the wilds of the Galloway peninsula. Agricola fortified the coast facing Ireland, and Tacitus recalls that his father-in-law often claimed the island could be conquered with a single legion and auxiliaries. He had given refuge to an exiled Irish king whom he hoped he might use as the excuse for conquest. This conquest never happened, but some historians believe the crossing referred to was in fact a small-scale exploratory or punitive expedition to Ireland, though no Roman camps have been identified to confirm such a suggestion.