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!
A wagon of meat found in a vampire infested cave. Not sure exactly what the vampires are planning to do with meat wagons, but it must be devious.