Military history of Ireland
The Vikings pillaged monasteries on Ireland's west coast in 795, and then spread out to cover the rest of the coastline. The north and east of the island were most affected. During the first 40 years, the raids were conducted by small, mobile Viking groups. From 830 on, the groups consisted of large fleets of Viking ships. From 840, the Vikings began establishing permanent bases at the coasts. Dublin was the most significant settlement in the long term. The Irish became accustomed to the Viking presence and culture and in many cases became allies, with intermarriage common throughout Ireland. A major Irish battle involving Vikings was fought at the Battle of Clontarf in 1014, in which a large force of Vikings and their Irish allies were defeated by the gathered Irish forces of Brian Boru, then the High King of Ireland along with a small contingent of Viking defectors. After this date Viking activity was sporadic with various Kings and nobles attempting to extend their power base. In 1099, Magnus Barefoot, the King of Norway, and his Viking army had successfully campaigned alongside their Irish allies against opposing Irish warbands. On his return his force was ambushed and killed on the north coast of Ireland.
Salme ships
According to an early interpretation offered by Jüri Peets, the lead archaeologist at the site, the ships and the dead are of Scandinavian origin. According to the most likely scenario, a war party of Scandinavians attempted to carry out a raid against the Oeselians (Estonian inhabitants of the island of Saaremaa), but were attacked by Oeselian ships. The sides of the two ships contain numerous embedded arrowheads, some of which are of the three-pointed type used to carry burning materials to set enemy ships aflame. After losing too many oarsmen to the Estonian archers, the raiders pulled their ships aground and tried to defend themselves behind them. It appears that after the battle, the Oeselians allowed either the survivors or some other group of Scandinavians to ritually bury their dead. The burial is unusual because the ships were not covered with earth mounds. The site was eventually forgotten by the local inhabitants after it had become overblown by sand and covered with vegetation. The raid-hypothesis has led to a questioning of when the Viking Age began exactly. The Salme event took place 50-100 years earlier than the infamous Lindisfarne Viking raid in England in the summer of AD 793.