Adversary

The person or group you are pitted against represent something, probably within you that you are in conflict with. Such dreams show parts of your nature you struggle with. Jung called this the Shadow, the aspects of yourself you are frightened of, or repress for one reason or another. Enemies in dreams usually refer to some facet of this. Though it may simply depict something you are struggling with, a relationship for instance, or feelings about work.

Because the enemy is usually an aspect of yourself, real change can occur by relating differently to each other. For instance if you are lucid in your dream you can become them so fully there is no problem.

Useful questions:

What is it in me that I am in conflict with?

If I imagine myself in the dream is there any way I can resolve the enmity?

What is the action in the dream and what does this show of the details of the conflict?