it seems to take alot longer then is should. i just made about 12 sweeps of a L3 flat and got 4 medals. 2 rose, 1 cross, 1 lion. It took about 1 hour. And 75 attempts. I sent 5 waves of archers to the flat right next to my town and abandoned them as soon as i captured and just kept making these sweeps. But it does take forever. I have low patience for this since the older servers drop medals about 2 to 3 times as fast.