Vikings from Mars were brought to Earth to spread their seeds and mix them with human seeds. Best way to do that is kill human men and take and mate with their women. It's been done that way forever and still goes on under the pretense and protection of religion and politics. The way to change and get rid of your enemies is to infest their culture and replace it with your own. Often this is done through wars, conquer, displace and sometime assimilate parts of the conquered culture into your own. In modern times it's easier, faster and less messy to infiltrate, move your people into foreign countries and slowly take over their lands; and replacing your opponents, those whose ideas and religious beliefs differ from your own. Which is happening big time all around the world today. Most people seem to be clueless of that fact. As clueless as humans are of the invasion from other planets in the solar system that have taken place throughout human history. Humans are nothing more than a Heinz 57 mixture of beings from various planets and moons in this star system and the cosmic beyond.
For all their infamous raiding and plundering, the Vikings who attacked from Scandinavia might have been just a bunch of lonely-hearted bachelors, new research suggests.
During the Viking Age, which archaeological discoveries and written texts suggested lasted from about A.D. 750 to 1050, shipborne crews from Scandinavia went "viking" — that is, they started raiding. However, the causes of these invasions remain uncertain.