Reply to Hey guys...I really don't understand battles.
Hey @cryptoctopus
You can use our simulator to understand how it works :
https://simulator.drugwars.io
If you have any coder knowledge you can also try to read the source code : https://github.com/FutureShockco/drugwars.js/blob/master/src/fight.js
But our advice until a new update, is to make a variety of different units, since they attack one time per group and per round.