Editing 875 (section)

==== Britain ====
* [[June]] &ndash; The [[Great Heathen Army]], led by [[Guthrum]], moves on [[Cambridge]]. He later returns to [[Wessex]], to establish a [[Cantonment|winter quarter]]. King [[Alfred the Great]] fights the [[Denmark|Danes]] in a naval engagement.
* [[Battle of Dollar]]: Invading Danish [[Vikings]] defeat the [[Scottish people|Scots]] and the [[Picts]], under King [[Causantín mac Cináeda|Constantine I]], at [[Dollar, Clackmannanshire|Dollar]]. They occupy [[Caithness]], [[Sutherland]], [[Ross, Scotland|Ross]] and [[Province of Moray|Moray]], far to the north.<ref>{{cite book|first=George|last=Bruce|title=Harbottle's Dictionary of Battles|publisher=Van Nostrand Reinhold|year=1981|isbn=0442223366|url-access=registration|url=https://archive.org/details/harbottlesdictio00harb}}</ref>
* Danish Vikings, probably led by [[Halfdan Ragnarsson]], invade [[Dublin]]. During the fighting, [[Oistin mac Amlaíb|Eystein Olafsson]], king of [[Kingdom of Dublin|Dublin]], is killed.<ref>''[[Annals of Ulster]]''.</ref>
* [[Donyarth]], the last recorded king of [[Cornwall]], drowns in what is thought to be the [[River Fowey]].<ref>''[[Annales Cambriae]]''.</ref>