Attackers used cannons too. Cannons eventually became so powerful that castles couldn't defend against them any more and the time of castles came to an end.

Attackers used cannons too. Cannons eventually became so powerful that castles couldn't defend against them any more and the time of castles came to an end.

When it comes to the Castle Doctrine in Pennsylvania, Bernie Brown, a criminal defense trial attorney out of Carbondale, says it's something that's been used since the state was founded.