User blog comment:Spritydove/Deeper Thought into the Civil War/@comment-5135631-20120703234539/@comment-5135631-20120707121555

If the Thalmor invaded Skyrim, they would be pushed out and would not try to intervene again until they have destroyed the Empire, which is exactly what they did in Hammerfell. Hammerfell is fine, the Thalmor haven't touched it. Now that most dragons are on the side of the Dovahkiin, the Thalmor would be burned to ashes.The Thalmor will attack once, get pushed out, and then leave it alone.

Ulfric would not invade the Dominion, he isn't stupid. He'd just defend his land which is easier to defend than attack.