here is the trick for the low level medals if you still need them... make heros... like 4-5... for each hero, "build" 800 archers... and then attack a level 3 grassland... do this in "rows" with 15 secs between... each team that attacks, when it wins, you immidiately "abandon" the valley, so that the next team which will attack 15 secs later also can attack the same spot...
Reason: everytime a valley is abandoned.. the computer places "NPC enemies" there to protect it.. + runs a "dice" for medal drop.. the higher the level area, the better the medals.... level 3= no cost for your armies if you bring 800 archers pr. hero... but remember to abandon between each hero hit..... otherwise the heros just returns without attacking... = waste of time...