Valleys are need throughout the game, but particularly at the beginning, when you are farming for medals to get promotions. Later you will want to conquer level 10 valleys, to increase your production of resources.
There is no absolute rule as to where medals are located. The valleys you search may yield nothing for days, or a high level medal might be found in a low level spot. The following are a general guide as to where they can usually be found (You will find more about level 10 npcs in another post):
From Weebly:
The best method to farm medals is to pick 1 valley and continually attack that particular valley over and over again using the take and abandon method spacing your attacks out about every 10 seconds.It may take you over 100 attacks on a valley before you get even 1 medal but dont loose heart or give up.
Cross Medals:
1. Attack any level 1 valley with 50 archers and 1 scout.
2. Attack any level 2 valley with 100 archers and 1 scout.
Rose Medals:
1. Attack any level 1 valley with 50 archers and 1 scout.
2. Attack any level 2 valley with 100 archers and 1 scout.
3. Attack any level 3 valley with 200 archers and 1 scout.
4. Attack any level 4 valley with 400 archers and 1 scout.
5. Attack any level 1 NPC with 50 ballistae.
Lion Medals:
1. Attack any level 3 NPC with 250-300 ballistae (depending on your hero’s attack level).
2. Attack any level 4 valley with 400 archers.
3. Attack any level 3 valley with 200 archers.
4. Attack any level 2 NPC with 125-200 ballistae (depending on your hero’s attack level).
5. Attack any level 5 valley with 750 archers.
Honour Medal
1. Attack any level 4 NPC with 300-400 ballistae (depending on your hero’s attack level).
2. Attack any level 3 NPC with 250-300 ballistae (depending on your hero’s attack level).
3. Attack any level 6 valley with at least 1,500 archers.
4. Attack any level 5 valley with at least 750 archers.
5. Attack any level 2 NPC with 125-200 ballistae (depending on your hero’s attack level).
Courage Medals:
1. Attack any level 5 NPC with 350-500 ballistae (depending on your hero’s attack level).
2. Attack any level 4 NPC with 300-400 ballistae (depending on your hero’s attack level).
3. Attack any level 7 valley with at least 3,000 archers.
4. Attack any level 6 valley with at least 1,500 archers.
5. Attack any level 3 NPC with 250-300 ballistae (depending on your hero’s attack level).
Wisdom Medals:
1. Attack any level 5 NPC with 350-500 ballistae (depending on your hero’s attack level)
2. Attack any level 7 valley with at least 3,000 archers.
3. Attack any level 8 valley with at least 7,500 archers.
4. Attack any level 6 valley with at least 1,500 archers.
Freedom Medals:
1. Attack any level 5 NPC with 350-500 ballistae (depending on your hero’s attack level).
2. Attack any level 8 valley with at least 7,500 archers.
3. Attack any level 7 valley with at least 3,000 archers.
Nation Medals:
1. After completely wiping out a level 10 NPC, allow 40,000 warriors to regenerate. Attack and defeat the level 10 NPC with 40,000 warriors regenerated.
Justice Medals:
1. Attack any level 10 NPC with at least 90,000 archers and a few thousand warriors, pikemen, and swordsmen. Do this at your own risk, and only do it if your hero’s attack is very high.
From Gamepedia on other methods:
Valley attack with Warriors
For those who do not want to send Archers, just Warriors*
Level One: 700 warriors
Level Two: 1,300 warriors
Level Three: 1,800 warriors
Level Four: 2,400 warriors
Level Five: 3,200 warriors
Level Six: 3,800 warriors
Level Seven: 5,200 warriors
Level Eight: 9,000 warriors
Level Nine: 16,000 warriors
Level Ten: 22,000 warriors
NPC City attack with Ballista
recommended method for Hero XP and resources*
Level One: 50 Ballista
Level Two: 150-200 ballista
Level Three: 250-300 ballista
Level Four : 350-400 ballista
Level Five: 400-500 ballista
Level Six + : not recommended, you WILL have losses
NPC City attack with Warriors
For those who do not want to send Ballista, just Warriors*
Level One: 1200 warriors
Level Two: 3000 warriors
Level Three: 15000 warriors
Level Four : 22000 warriors
Level Five: 32000 warriors
Level Six: 38000 warriors
Level Seven: 60000 warriors
Level Eight: 85000 warriors
Level Nine: 98000 warriors
Level Ten: 110000+
Note:*ALWAYS use a Hero with good (70+) Attack Stat
– Place a High Attack Hero as mayor before any attack! (gain a small attack boon!)
– Archery Research: minimum Level 7+
– Military Tradition Research: minimum Level 7+
– Horseback Riding Research: minimum Level 6+