The Bible says in II Corinthians 11:20 that a Christian should not turn the other cheek; that is, a Christian should fight back when attacked. II Corinthians 11:20 says:
For ye suffer, if a man bring you into bondage, if a man devour you, if a man take of you, if a man exalt himself, if a man smite you on the face.
God is condemning certain Christians for surrendering to bondage (slavery), being devoured (dominated), being taken of (robbed), allowing a man to exalt himself (act as if he were God), and being smitten on the face (struck on the face).
Christians, fight back!
Now, what about the turn-the-other-cheek verse, Matthew 5:39? Simple, Jesus was speaking figuratively. What Jesus meant literally was that a person should not have a certain kind of heart when fighting back; that is, a person should not fight back with a thirst for justice against their attacker. In other words, God wants your fighting to be guided by the goal of DEFEATING your attacker, not SATISFYING your hunger for justice.