I would imagine that defensive sensor drones would be the first priority. You really need to detect enemy drones and having a swarm of sensor drones able to fo

I would imagine that defensive sensor drones would be the first priority. You really need to detect enemy drones and having a swarm of sensor drones able to follow potential targets would be really good. Radar and microphones are going to be interesting when applied to drone detection. Once the target is detected, a rather large cheap swarm deployed on the attack vector to block projectiles and intercept the enemy drone would probably make the most sense. The drones can absorb the hits and blow up when they reach their targets. ECM-based solutions do seem to have problems with also taking out the good guys equipment and capabilities.