This is what I've found so far on average:

Level 1 lake/hill/forrest/lake/grassland
-send 400 archers and u get no losses

Level 2 lake/hill/forrest/lake/grassland
-send 400 archers and u get no losses

Level 3 lake/hill/forrest/lake/grassland
-send 400 archers and u get minimal losses

Level 4 lake/hill/forrest/lake/grassland
-send 400 archers, 100 warriors and u lose half or warriors and some archers

Now as far as medals go, I've read from another post that you need to attack those same places first with you main army then send in ATTACK with scouts to get medals. Is this true? Is this how you get medals?

Thanks.