You’ve probably heard people say
The best defence is a good offence!
But actually, Jesus said that if you live violently you’ll die violently. The best defence is probably nothing to do with fighting your adversary, but rather loving them. As a best case scenario, they’ll return the favour – and you both win. Worst case scenario, you love them, and they take advantage of you. Which sucks, true, but at least you’re behaving like God, and that is probably more important than winning anyway.