Original: In response, Norwegian king Harald HÃ rfagre ("Harald Fair Hair") annexed the Northern Isles (comprising Orkney and Shetland) in 875.
Simplified: From the Northern Isles they continued to raid Scotland and Norway, prompting Harald HÃ rfagre to raise a large fleet which he sailed to the islands. In about 875 he and his forces took control of Shetland and Orkney.