Mercian villages, and Danish political terminology introduced instead of English. Politically also there was a considerable re-organisation, the land being divided into five districts, each with its own "army" under an independent jarl, and each having for its centre a fortified camp, which the settlers could garrison in times of stress. The five centres selected were Lincoln, Stanford, Nottingham, Derby and Leicester, and as the term burh at this date still had the meaning of "a fortified place," they soon came to be specially known as the "Five Boroughs."
Meantime in East Anglia and south-east Mercia affairs did not progress so swiftly towards a settlement. The rank and file of the army, which encamped in Cambridge in 875, would doubtless have been well content to form "borough districts" between the Thames and the Welland similar to those which were being set up between the Welland and the Humber, but their leader, Guthrum, coveted Alfred's dominions as well, and when he heard that fresh fleets were in the English Channel attacking the southern coasts of Wessex, he could not resist joining in the enterprise. Already in 875 there is mention of Alfred fighting the Vikings at sea. The next year a fleet appeared off the coast of Dorset over a hundred strong. The chronicler, Aethelweard, alludes to it as a "western army." The bulk of it therefore doubtless came from Ireland, but help reached it from Guthrum. Landing near Poole harbour, the allied vikings proceeded to harry the surrounding districts, and then seized Wareham after out-manoeuvring Alfred's forces. When winter approached, Alfred thought it best to offer terms. The vikings however treacherously deceived him, and, having accepted a sum of money on the condition that they would decamp, slipped out of Wareham suddenly and made a dash for Exeter, with the intention of using it as a base from which to ravage Devon. In 877 the luck turned. While Alfred kept the viking land-force shut up in Exeter, their fleet came to grief in a storm off Swanage. This disaster placed the marauders in a precarious position. Before the end of the year they had to capitulate, and if Aethelweard's account is to be believed, retired to Gloucester. Once more Wessex appeared to be saved. In reality the worst crisis of all was at hand. About midwinter Guthrum threw his whole army unexpectedly upon Wessex, and almost surprised Alfred at Chippenham where he was keeping Christmas. At the same moment Halfdene's brother Ubba, sailing from Dyfed, invaded North Devon. The brunt of Guthrum's invasion fell upon Wiltshire, but other shires also suffered severely, and so great was the general terror that many of the West Saxon leaders fled over sea. Alfred however never despaired; getting away with difficulty from Chippenham, he retired into the marshlands of Somerset and stockaded himself with Aethelnoth, the alderman of the district, in the island of Athelney at the junction of the Tone and Parret. There he remained on the defensive till the news came that the men of Devon, led by their alderman Odda, had defeated Halfdene's
