One of the main bases was the Isle of Man. Such garrisons formed a stronghold in the middle of the Irish Sea between the slaving town of Dublin and the mainland of Britain.
THE RAID ON MAN
Our battle concerns a raid by Arnulf Johansson and his ambitious Viking crew as they land on the island to raid the village of Garth, under the lordship of Ivar the Red, scourge of the Irish Sea. The settlement is close to the sea and contains a scattering of Norse houses and a