At that time, the Vikings did not know Christianity. The belief in the gods in Norse mythology made the Viking warriors always enthusiastically fought one-on-one. Norse mythology emphasizes that a true warrior must die at the battle of money and become a resident of Valhalla (where the gods reside) after death, along with other gods. If a Viking warrior dies of old age or dies in a hospital bed, the soul will be exiled to Hel (cold dark underworld). A true warrior is afraid of this second death, so they always fight with courage.
The Vikings were famous for being good warriors. That is due to many factors: their ships are fast and can travel long distances. With 200 warships, they can carry 5,000 troops a day for 150 nautical miles (about 280 km), so the enemy often cannot gather forces to defend and deal with. In addition they have the ability to quickly land on beaches or along small rivers without the need for ports. Their snekker warships are light, easy to bring to land.