Huge swarm of Dragonflies eating flying ants swarming trying to fly away from ant bed!

A section of my yard had an uncountable number of Dragonflies hovering 3 to 5 feet above the ground catching every flying ant that tried to leave the ant bed and fly away. I showed you a small area of the yard, but it looked to be about a 1/4-acre area that was swarming with Dragonflies.