quality:correction, linguistic:translation
Viking invasion

In 868, Alfred was recorded as fighting beside Æthelred in a failed attempt to keep the Great Heathen Army led by Ivar the Boneless out of the adjoining Kingdom of Mercia. The Danes arrived in his homeland at the end of 870, and nine engagements were fought in the following year, with mixed results; the places and dates of two of these battles have not been recorded. A successful skirmish at the Battle of Englefield in Berkshire on 31 December 870 was followed by a severe defeat at the siege and the Battle of Reading by Ivar's brother Halfdan Ragnarsson on 5 January 871. Four days later, the Anglo-Saxons won a victory at the Battle of Ashdown on the Berkshire Downs, possibly near Compton or Aldworth. The Saxons were defeated at the Battle of Basing on 22 January. They were defeated again on 22 March at the Battle of Merton (perhaps Marden in Wiltshire or Martin in Dorset). Æthelred died shortly afterwards in April 871.