The medal

You need medal for three things, getting promoted, (you need to get pro,oted to be able ta ake or make more cities) persuading heroes, or rewarding them.

The most important is promotion, the less is rewarding since you can reward wuth gold too. Medal have the advantage that give more loyalty points at once, so if you need it fast is a good thing to use medals.

The most rare is persuading heroes, becsause you do not captgure heroes so often.

Anyway, the trouble with medals is getting them. You can buy boxes with medals if can afford, or you can get them attacking succesfully valleys or npcs. Sometime they came often sometime very rare, depend on how are the chances set by game owners.

Anyway, if you need those in low level vallys, there is only the annoying repeated attacks. But if you want justice or nation medals, you get them seldom in high valeys, or quite often in npc10. But npc 10 costs a lot of soldiers. Those damn lvl 10 npcs have 400000 warriors, who revive 10 pecent at every 5 minutes, but the most annoying is the wall defences that revive 90 percent almost instantly. Fortunately next time will be 90 percent from 90, so in time will be easier if you come with many attacks.

But if you are not well prepared, soon you will be overwhelmed. So even you get one medal at every 5 minutes when you wipe 40k wars, when you need 30 or more medals, you will notice that the task will cost you many days of preparing.