You should have acted. They're already here. The Elder Scrolls told of their return. Their defeat was merely delay until the time after Oblivion opened, when the sons of Skyrim would spill their own blood. But... there is one they fear. In their tongue he is Dovahkiin; Dragon Born!
High Hrothgar sits atop the seven thousand steps to the Throat of the World, which is the highest mountain in Skyrim and second highest in Tamriel.