Posted 14 August 2012 - 02:28 PM
Yeah it seems much more likely that Ned taught Rob and Jon everything he knew about the North and war. I mean Ned was in the thick of 2 rebellions and ruled the North for the last 15 years. It seems almost a given that he would teach them the ways of war, and, more importantly, how to be a Lord. This was probably taught to Rob and maybe Bran, but I'm sure Jon was there as well. I mean if Bran knows all the Lords in the North from watching his father guest his bannermen, then isn't it obvious that Rob and Jon would know all of this too.
And Jon would surely have heard Ned talk about all his bannermen and their brothers, fathers, cousins. So it's very likely he remembered Ned, or one of his men saying of Arnolf, "he was never the fighter his father was". Arya or Bran might have even heard that.
And knowing that the Dreadfort is an extremely hard castle to mount a siege on would be common knowledge for a Stark boy as well. I mean it's not like the Starks have never had to rise up to beat down a rebel Northern house before, plus I'm sure Ned took Rob and maybe Jon along on visits to his bannermen 's homes. Even if Ned only took Rob, it seems pretty likely that Rob would have told Jon about everything he saw. Or if not Rob, then one of Ned's men might have described the Dreadfort.
Plus, even if Ned or his men didn't teach Jon about the North, Luwin did. Of that I'm sure. If he taught him about the stars and all the different banners, he taught him about their strongholds as well