That was the problem, they couldn't. The use of castles changed and battles were fought on open ground where the two armies lined up and then charged. Battles got bigger and the weapons used more powerful as time went on.
how did the castles defend in 1215
around about 1100 to defend their land against raiders and other enemies
youcan defend catles with knights
Castles don't attack they defend.
Because before gunpowder castles were virtually impenetrable. They were very good fortresses.
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Because your mom was there. Here is the video to prove it: http://www.youtube.com/watch?v=4MT5oNEHrNs
The castles were used to defend an area.
Cannon and gunpowder.
The reason is fairly simple. Castles were a strong point and a defensible position when under attack, sometimes for weeks. With the coming of gunpowder and cannons, they were no longer able to defend them for a long period and for that reason became obsolete. The nobility then spent their money on creating an elaborate dwelling instead of a castle.
The Byzantines use Greek gunpowder to conquer lands and fight off enemies. They have a strong army.
The introduction of gunpowder made castles inefficient.