Attacking valleys is a great way to generate resource in Evony . But to get resource you have to attack the valley without conquering the valley. if you attack a valley with your valley slot full then you wont be able to capture the valley but you will get 300-600k resource from that valley.
Again if you capture a valley and then release it then the valley will regenerate the resource and troops within it. Thus you need two cities near a lvl 10 forest or hill.
1) Send 30k archers, 1 work,war,sc,pike,sword,cav,phract from the first city with...