Having a temporary war refuse
After being attacked by another player, there should be some kind of temporary war refuse applied. For example if they completely destroy all of you're troops, add 2 hours of war refuse. And if they do only 50%-99% damage add 1 hour. If it is under %50 damage, no war refuse would be applied. This might help other players from taking relentless attacks back to back in a short period of time.