One thing which kind of triggered me in ASOIAF was also the fact that castles are kind of useful in ASOIAF. GRRM literally made absolute gigantic castles in his world but at the same time made them useless. He described Winterfell that you could defend it with 500 men against 10k but at the same time when he described war in the riverlands every castle was taken in matter of days which really bothers me. Especially when you realise how much time he spend describing some of the major castles (Casterly rock, Storms end, Winterfell, Highgarden etc. etc.) And then he decides because of the story that Mountain with few hundred men (I doubt that Mountain had more than 3k men I think the biggest number could be around 2k) literally in few weeks conquered half of the castles in Riverlands. And not only just the small keeps of some landed knights but literally castle of one of the biggest house in Riverlands like Brackens castle Stone Hedge or Pinkmaiden. Its kind of funny when you realise that he managed to conquer castle Darry with only 300 hundred riders from Tywin. Like I understand that GRRM needed some kind of blitzkrieg from Tywin so Robb could look like epic hero who fought against all odds but still it feels weird. At least if George said that they surrendered the castle or the left there small army to continue in the siege but noope.