Not sure you actually have a robbing problem. What do you mean it looked like a war zone.
Bees bearding does not always mean they are swarming.
Where did you get the swarm from, near your apiary. Your hive be may have swarmed if the swarm was near your hive. If so, get real close to your original hive and listen for piping sounds. High pitched chirps. If you hear them, see you many different sounds you can hear. Each sound is a different queen.
If you do hear them, let me know.