An Imgur user just couldn't wait to find out what was said in Sansa Stark's letter from "Game of Thrones" so they did a little investigating an this is what they came up with.
From this angle you can makeout “to fufill”, “for Winterfell” and “rewarded.”
This scene is where most of the message comes in.
Flip it.
Zoom in.
*CSI voice* Enhance! “[…] to protect me. Now you have a chance to fulfill your promise. […] Knights of the Vale are under your command. Ride north for Winterfell. Lend us your aid and I shall see to it that you are [well/properly] rewarded.”