Protective features of a Castle.

Some protective features of a castle are a moat witch is a river going around the castle. I would not want to fall into that. Another feature is the big walls that the castle has around it so enemy's cant climb into the castle. A draw bridge is a protective feature because that is the only way in and out of the castle but there might be a secret way out of the castle.Most castles have one secret way out because if the enemy get in the city the price and people can get out that way. castles had big crossbows on top of the big walls to shoot the enemy. That would be cool to shoot but not to die by though. castles have also