Brunhilde didn't agree with Odin on a certain matter, and cast her down to the mortal realm as punishment. Additionally, she was to sleep surrounded by a ring of fire of which no mortal man could enter. Siegfried managed to go through and wake her up. In order to find Siegfried, Brunhilde put out a competition for her hand in marriage, which was to impress her, then best her in combat. If they failed, she got to kill them. According to the lore, one of the tasks was to do better than her at a boulder toss, which she threw ~72 feet and then jumped on top of it in a single leap. He then beat her in combat, all the while posed as Guenther.
You can imagine how pissed Brunhilde was when she learned that she had been tricked like this.
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