Blind luck is how you get a medal. Yesterday I killed an army of 1.5 million elites. We dropped nearly a combined 600k net and scored nearly a combined 40k mil points. Unless they are updating later than 0130, that was not enough to get me a medal.
Makes you sad sometimes. On another day someone recently got a medal for a battle about 1/5 that size. Made him quite happy. Basically, you never know if you've done enough. I'd love to see the battle that beat mine yesterday though. Had to have been very impressive.
Edit: Nevermind, apparently that kill was enough to get a medal after all.
That makes me a very happy camper. It just didn't show up for me until 0630 server time. The point I tried to make is still valid. If it had been the day before, I know it would not have been enough.