Hello, I am a new beekeeper, having just caught a swarm this past April. I keep a top-bar hive that has been seemingly healthy and active. Yesterday, however, I noticed fighting bees, dead bees in the grass near my hive, and bees with their wings bitten off near the hive. I identified it as robbing activity and quickly reduced the entrance to a 1 and half inch opening. Today, there is very little fighting activity, but half of the bees I observe going in and out of the hive are not my bees. Does this mean my bees have become so weak that they can no longer fight off the robbers? If so, can anyone suggest how I can save my bees?