Range for Target spell?

[Tianx]

Is there a certain range where the enemy need to be in order for them to be effected by the Target spell? Sometimes, I feel either the spell isn't working properly or the units is too far out to be effected by the spell and end up wasting 1 round casting the spell.

Also, will Target spell effect the Feared units? For instance, I have peasant and demon in my army, I cast Fear on enemy unit, archer and then cast Target on demon, will the archer skip its round because it cannot attacked higher level unit because of Fear or will it choose to attach peasant instead??