Early writers tell how an island off Skerries was used as a
landing place for an invasion, which happened in the second century. This
island was either Shenick or Red Island, which would have been a tidal island
at the time. When the invaders landed, they formed ranks and at low tide
marched to the mainland, where they were promptly defeated at the ancient
settlement of Knocknagin, north of Balbriggan. The islands were previously
known as the
