Take a Look at this thread before going on ahead and creating your own threads when pitting two foes against one another.
Make sure you read the rules and instructions from the following pages to make sure you have a clear understanding of what is necessary:
Or to simplify. have the following:
Time of Day:
List of opposing armies:
Who leads each armies:
What are each armies composed of (Specify the specific units) and how many for each and the army in total:
Prelude (Some description of what happened before that led to this battle):
Battles Ste Ups (Energy/Speed Equalization, Restricted units or powers, etc.)
All of This is available for further understanding in the links above.
Also, while this wikia is devoted to crossover battles between two or more armies, this can be used for one on one battles as well, but they don't get the win/lose scoring or a page documenting the battle (Unless voted for it's creation). Just follow this page: https://universeconquest.wikia.com/wiki/One_on_One_Battles