The game doesn't give you a loot bonus if you don't have a league when you attack. So to not lose out on those much desired spoils of victory, simply start an attack, drop a hero or a single inexpensive troop then leave. Yes you will lose some trophies but you will be placed in a league so that your next attack will be eligible for the loot bonus. I forgot and missed out on some sweet champions III bonus. Don't want the same to happen to everyone else. Clash on!