893 - Internal power struggle Orkney

Orkney
Guttorm became earl of Orkney and the year after 894, Halland became the new earl, but he abdicated and Orkney was then ruled by Torf-Einar from 895-905.
Viking raiders based in the Orkneys raided into Moray Firth. 

Scotland
The Danish vikings began an offensive in Scotland in which "the flower of the Pict nobility was destroyed".

Thereafter, Halfdan broke away from the Great Danish Army to attack eastern Scotland.
Wales & England
The Danes, led by a man named Haesten, marched up beside the Thames, crossed over and ravaged the Severn Valley. Welshmen from Gwent and Glynwysing, as well as some of Anarawd's men from Gwynedd, cooperated with Alfred the Great to battle and defeat the raiders at Buttingtune on the Severn shore