Bee attack on the apiary. What to do. Effective adaptation against attack

A bee attack by bees of one colony on another is a frequent occurrence among beekeepers in the fall. At this time, there is no bribe and bees of productive families can attack other families in order to get hold of honey reserves. What should a beekeeper do in this case? There is an effective adaptation against the attack, which I use if it suddenly happens in my apiary. I tell and show the device and how to use it.