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It was capable of sailing 75 miles (121 km) in one day, held a crew of about 20-30, and knarrs routinely crossed the North Atlantic in the Viking Age, carrying livestock and goods to and from Greenland and the North Atlantic islands.
NOVA: What did the Vikings actually do in their attacks into Europe? William Fitzhugh: Well, the attacks were very diverse. One misconception we have is that swarms of Vikings raided constantly all over the place, and it really wasn't that way. For the most part, the raids were totally independent.