Erik Bloodaxe, Ivar the Boneless and the Great Cnut more influential than previously thought?
It has long been known that the Vikings influenced the English language after they first arrived in Lindisfarne in 793 and until the Normans took control in 1066, but the consensus was that the main influence on the language was Anglo-Saxon, also called Old English, which was introduced in the Fifth Century. After the Normans invaded, integration of the peoples occurred and Middle English, the precursor of Modern English evolved from Old English and Scandinavian.
Normally when a new language is integrated with an existing one, the existing grammar stays much the same and loanwords are added, but new research has shown that Middle English adopted much of the Scandinavian grammar.
Of course, the Vikings didn't always win: