After being attacked by one dragon at the Western Watchtower already, I continued on west - to Sky Haven Temple, but was attacked by yet another dragon - a named dragon (his name escapes me). At first he was was flying along the horizon. When I got closer, I saw some Stormcloaks fighting some Thalmor. The dragon landed and used his frost breath on the Justiciar, and the 2 Stormcloaks completely murdered the two Thalmor soldiers (seriously, they kicked their asses). And what do you know a giant comes up out of nowhere and starts beating the dragon with his club - and the Stormcloaks joined in. I just sat back and watched. But the Stormcloaks won, and the giant just walked away.
And then I got attacked at Karthespire by another dragon, and he was flying around the Forsworn encampment; fireballs and arrows was flying everywhere, and it was night, so it looked like something out of StarWars.