Giants and Wargs under the Direwolf Banner

What if Ned had ridden North of the Wall ten years before Jon Arryn's dead? What if he had recruited wargs and giants? And then, when Robb had to march south to free him, what if he had giants and wargs to employ against Tywin Lannister? And if Jon was one of those wargs? If Lady had survived the Trident? If that led to the Blackfish leading half his forces? A sort of fix-it fic