The battle was going on for like 15 minutes. Just me and the Dragon. Apparently this was a frost breathing dragon, so as a Nord I was highly resistant to it. I kept poisoning my silver sword and waiting for it to land to whack it and then used my shield from protecting me from the Dragon trying to whack his head at me. So this went on for 15 minutes until I was almost dead and he was almost dead. And then I switched my shield for restoration and I took quick turns between slicing and healing. It was like slice, heal, slice heal. And then he died.