A place defended by a wall is called a building. If it's a really strong wall, it might be called a fortification (or a fort, for short).
people
guards soilders
there wasn't anything to defend it from.
Soldiers defended the Great Wall of China by standing guard over the wall from the watch towers
There is no such wall. It is popular to believe that this was the role of Hadrian's Wall however the reason for its construction is unclear. It was built by Romans and could have been used to control immigration.
Castles usually defended themselves by having a wall with a moat or ontop of a hill
because the wall that the Saxons had made had defended them from the arrows
Some of the best soldiers had to guard it and fight against the people coming to invade China
people flung slushies from the top and brain-freezed their enemies to death
His mother defended him with love. Harry loves his friends.
william the silent defended the prostant cause in where?