Help! I'm being robbed!

The honey harvest is being postponed or cancelled.  There has been an attack on the hive.  I went out to check on the bees the other day, and I notice a great amount of activity at the entrance to the hive and on the front of the hive.  Upon closer inspection I saw that bees were fighting at the entrance and in the grass in front of the hive.  I also saw some wasps in the fray.  Hive robbing!  I put an entrance reducer on when I saw this, and the robbing continued but slowed.  Today I put a wet sheet over the hive.  I suspected that some of the robbers were getting in through a crack on the top of the hive.  The sheet leaves the entrance exposed and will hopefully block the "backdoor".

I'll keep you posted on the activity!