There was not a Viking army, but all men learnt to fight and use weapons from an early age. They used swords and axes, but wore little protection. A group of warriors called the beserks fought with no protection at all.
Ragnar Lothbrok, a viking who's name is know in Scandinavia, after defeating the earl of his town. Ragnar is very strategic and knows how to handle a sword in battle. Ragnar who be a very good person to base my main character of as he is a very able hero.