If the Vikings can be broadly split into three distinct groups, the question becomes: what was the difference between Danish, Norwegian, Swedish Vikings?
Do you use the word Viking correctly? Language matters, and how a person uses language significantly affects their worldview and how they perceive people, objects, and concepts.
That they appeared suddenly in the historical record has launched historians, archeologists, and various fields of science on a quest to answer the question: What caused the Viking Age?
Les Vikings à Noirmoutier: En 799, une flotte de « drakkars » apparut au large de l’île de Noirmoutier, qui débuta deux siècles d'attaques et d'invasions.