At the end of the eighth century the first Viking raiders appeared in Irish waters. These raiders came exclusively from Norway. The first recorded raid was in 795 on Rathlin Island off the coast of Antrim where the church was burned. On the west coast the monasteries on Inismurray and Inisbofin were plundered possibly by the same raiders. The Scottish island of Iona was also attacked in the same year. For the first four decades, 795-c.836, the raids followed a clear pattern of hit-and -run affairs by small, probably independent, free-booters. Attacks were usually on coastal targets no Viking raid is recorded for areas further inland than about twenty miles. These attacks were difficult to defend but the Vikings were sometimes defeated. In 811 a raiding party was slaughtered by the Ulaid and the following year raiding parties were defeated by the men of Umall and the king of Eóganacht Locha Léin. By 823 the Vikings had raided around all the coast and in 824 the island monastery of Sceilg, off the Kerry coast, was attacked. The monastic city of Armagh was attacked three times in 832. In the first quarter century of Viking attacks only twenty-six plunderings by Vikings are recorded in the Irish Annals. During the same time eighty-seven raids by the Irish themselves are recorded. An average of one Viking raid a year can have caused no great disorder or distress in Irish society. Attacks on Irish monasteries were common before the Viking Age. The burning of churches also was an integral part of Irish warfare. Wars and battles between monasteries also occurred in Ireland before the coming of the Vikings. Irish monasteries had become wealthy and politically important with considerable populations. The Vikings attacked the monasteries because they were rich in land, stock and provisions. They also took valuable objects but this was not their primary concern. Intensified Raids and Settlements From c. 830 Viking raids became more intense in Ireland. In 832 for instance, there were extensive plunderings in the lands of the Cianachta who lived near the sea in Louth. In 836 the Vikings attacked the land of the Uí Néill of southern Brega and attacked the lands of Connacht. In 837 a fleet of sixty ships appeared on the Boyne and a similar fleet on the Liffey. Soon afterwards Vikings made their way up the Shannon and the Erne and put a fleet on Lough Neagh. The Vikings wintered for the first time on Lough Neagh in 840-41. In 841 they established a longphort at Annagassan in Louth and at Dublin and used these bases for attacks on the south and west. They wintered for the first time at Dublin in 841-842 and in 842 another large fleet arrived. Also in this year there is the first reference to co-operation between Vikings and the Irish though this may have occurred previously. A fleet was based on Lough Ree and the Shannon and built a fortified position on the shores of Lough Ree from where they ravaged the surrounding countryside in 844. Máel Seachnaill, overking of the Uí Néill attacked the Vikings, captured a leader called Turgesius and drowned him in Lough Owel in Westmeath. From now on Irish kings began to fiercely fight back against the Vikings. Because they now had fixed settlements or fortified positions they were vulnerable to attack. Máel Seachnaill routed a Viking force near Skreen, County Meath and killed 700 of them. At Castledermot, in Kildare, the joint armies of the kings of Munster and Leinster defeated a large force of Vikings. The newly founded Viking settlement at Cork was destroyed and in 849 the Norse territory of Dublin was ravaged by Máel Seachnaill. The Vikings were now a factor in the internal politics of Ireland and were accepted as such. Norse-Irish alliances became commonplace.