Medal Hunting

Fill all your feasting halls with heroes
Fill all of your valley slots
then use the following neat goal

safevalleyfarm 10,9,8,7

Rose medals are most likely to drop from grasslands and lakes so concentrate your archers into cities with the most grasslands and lakes nearby
For each safevalleyfarming mission you'll need
1 scout
1 ballista
1 pike
1 sword

plus

For lvl 7: 4000 archers
For lvl 8: 8000 archers
For lvl 9: 15000 archers
For lvl 10: 30000 archers

Happy Hunting

P.S. It's safe to use "safevalleyfarm 10,9,8,7" - it only sends out missions if/when you have enough troops.