If the enemy is someone you know, perhaps you have unsuspected feelings of animosity towards them. A fight between a younger and an older person in your dream may suggest a rivalry between the dreamer and authority.
A fight between people of the same age may represent the struggle for recognition or sibling rivalry. Similar interpretations can be applied to any kind of struggle in your dream. Such fights usually depict a fight for freedom, independence or the truth. Your unconscious may also be urging you to work out why there is a conflict, and may be suggesting that there is a more subtle way of dealing with it than with fists. According to Freudians, the struggle depicts the battle between your father or mother for the attention of the other parent. [1]
Conflict or clashes with social strictures, other’s ideals, or your own sense of right and wrong.
Jungian: Self-conflict between what we wish to be and what we truly are or how we perceive ourselves.
A battle raging between the conscious and subconscious, between thought versus emotion, masculine traits versus the feminine, etc.
Releasing anger and related emotions that otherwise get subdued, or for which we do not have an adequate avenue of expression. [2]
The degree of change can be determined by how hard you fought, and if you won or lost the fight.
If you dream of others fighting it is telling you to be more careful with your financial dealings, and watch your spending. [3]
If nothing is changing in your life, it may be a clue that a change is needed or that you want to change internally. Fighting with strangers usually represents an internal struggle. Fighting with familiar people may be an extension of daily life and a reflection on your relationship with them. [5]
If you saw others fighting in your dream, you are unwilling to admit your own problems and turmoil. You need to take more responsibility for solving your own problems in real life. [6]
If you are successful in your dream, then you will overcome your difficulties. [7]
A fight breaks out among family members: a separation is to take place [8]
The dreamer must find an outlet. [9]
A bad dream for merchants, soldiers and sailors. [11]