Stone-keep castles were far larger than motte and bailey castles and could contain many more men. They were far more difficult to assault due to their massive size. However, they had two major flaws: there was nothing you could do if the enemy encircled you except stay in the castle. And second, they were easy for them to capture if you weren't vigilant. If you block off all the entrances and exits, then nobody can get in or out. But you need to check these places regularly - under bridges, inside trees, anywhere someone might try to hide - and repair any damage immediately so it doesn't hinder your escape. Also note that some parts of the castle may be damaged but still functional. For example, an upper floor window will most likely not open, but it doesn't matter if there's food inside - you won't be able to reach it anyway. So check around carefully before you start building up inside the castle! Finally, keep in mind that if the enemy captures the castle they can destroy everything connected to sheltering refugees or escaping prisoners. This includes roofs, floors, walls, anything that could provide protection or hiding space. So, the main weakness of a stone-keep castle is its size. It's easier for enemies to surround than to attack. You must protect all the important areas of the castle at all times or else people will die.