How is Beowulf and the 13th Warrior alike?

OH my gosh! I did a free response paper on this. I thought the whole mountain scene was similar to The Hobbit: neither Bilbo nor Beowulf could find the door to the mountain, and also the dragon: both dragons sat on treasures. The whole story is like the hobbit. All of a sudden he's called on this journey to defeat a dragon, and the reason why is... cloudy.