Battle Dawn Galaxies XP System Guide by Kolopaper
Ok, we have finaly recived the info about how XP work! 
XP gain per unit in battle = round*(numOfKilledEnemySoliders / numSurvivingWinningSoldiers) (rounded upwards)
If you win a battle lasting 1 round where you have 10 soldiers and he have 10 soldiers, and he kills 5 of your solders yor units will end up with 10 XP, devided on how many units you got left. Which in this case is 5, which give each of your units 2 XP
When a unit hit XP level 3,6,9 and so on you get +1 hp OR +1 damage
So thats it, the great mystery have been solved!
