Rude earthen or stockaded forts, serving as magazines and places of retreat, were erected; or in some cases use was made of strongholds already existing, such as Dun Almain in Kildare, Dunlavin in Wicklow and Fermoy in Cork.
Late in the same year or early in 1615 a stockaded trading post called Fort Nassau was erected on Castle Island, now within the limits of Albany, and a few huts were erected about this time or earlier on the southern extremity of Manhattan Island; but no effort at colonization was as yet made.
They are a quiet and inoffensive folk, who dwell in stockaded encampments, and preserve their ancestral language and customs. For an account of early Indian civilization in Costa Rica, see Central America: Archaeology.
In the neighbourhood are a cromlech and two ruined towers, and crannogs, or ancient stockaded islands, have been discovered in the lough.