Their arrival seems to have disturbed the Gaelic lake-dwellers of this region, for about this time we find people, whose culture show Breton affinities, settling on either side of the Irish channel. In the lake-villages of Glastonbury[507] and Meare we have evidence of the arrival of these refugees, and similar evidence may be found in Ireland, which received its first knowledge of iron and La Tène culture about this time.[508] In Ireland these timid folk built their usual lake-dwellings, and _crannogs_, in the lakes, though Macalister has recently seen in these fortified habitations evidence of the arrival of Gaelic conquerors, who thus defended themselves from the treachery of their subjects, among whom they were very unpopular.[509] But, as we have seen, the Gaelic war lords, with their bronze swords, had reached Ireland nearly a thousand years before. It was during one of these late Kimric movements that the Belgian tribes began to cross the channel into Great Britain. It is doubtful, at present, whether the introduction of the use of iron and La Tène culture, which took place about 450 /B.C./, is to be attributed to them, for there were probably many trading posts along the coast, like the one excavated at Hengistbury Head,[510] which were in touch with the continent and could have imported these wares. Some of these settlements may even be earlier than the La Tène period; this is suspected in the case of Hengistbury, and was certainly the case at Eastbourne,[511] if the pottery found there recently really betokens a trading post, and not the arrival of a small group of Gaelic refugees from the further bank of the upper Rhine. But these Belgic invaders were almost certainly responsible for the hill-top camps, which in the south of England seem to be earlier than 200 /B.C./, though probably much later in the north and west. To them we must also attribute the introduction of pedestal vases and other types of pottery which come, undoubtedly, from the Belgic area on the continent. Such Belgic movements continued until the first century, and had only ceased shortly before the arrival of Julius Cæsar in northern Gaul.