While we're not sure the exact number of drones that constitutes a "swarm," this footage of four Russian KUB-BLA loiter munitions attacking at the same time is probably the closest thing we've seen in a real-world combat application.

The exact target description isn't specified but what we assume are Ukrainian troops can be seen walking and running in the area as the suicide drones arrive in rapid succession. The Kub is propeller-driven and can travel at speeds between 80km/h and 130km/h and can delivers a 3kg explosive payload. It has a loiter time of 30 minutes and a range of up to 40km.