So, I was walking back to Whiterun from Drelas' Cottage. I near Bleakwind Basin and out of no where, an Elder Dragon appears. He begins to attack me. After a few strafing runs, he proceeds to land. Upon doing this, the Mammoths of Bleakwind Basin unite to defend their home. Five Mammoths, I count five, swarm the Elder Dragons. The Elder Dragon attempts to fly away, but the damage has been done. He crashes, skidding across the plains of Whiterun. The Mammoths then bull-rush the Elder Dragon and swiftly finish him off. Undirectly, they saved my life, because I was depleted of my healing potions and my Restoration was not at a level ready to defend against an Elder Dragon. I have decided to resign in my duties as Dragonborn. Alduin has far greater problems than me.

A truly epic battle. Do you guys have any epic stories of your own?

I have seen a solitary Mammoth take down a standard nameless 'Dragon' a couple of times. They are ridiculously sturdy.

Forget about Dragons. When the mammoths and giants decide they want a turn in charge of Tamriel, then we will face our greatest threat.