Prestige for Retreating

I think prestige should be given out if someone withdrawals. I mean come on someone attacks you; you destroy their cats so they withdrawl. Just yesterday someone attacked me in pvp. I destroyed their cats yet I get nothing bc they withdrawl. There definitely needs to be some kind of change here. With the amount of coin some ppl buy the 5 needed to withdrawl isn't anything. A % of the prestige should be given. Also, while I like the sliding scale idea is great it would be worthless in the situation you destroy half the opponents army. They most likely don't have a lot left to withdrawl