Comment by LorenPechtel

Lots and lots of drones--it's just the drones were all picked off, the only things that got through were some of the ballistic missiles. Most of which were aimed at things that they shouldn't have been shooting at in the first place.

And Iron Dome scored on the ballistic missiles, I would assume Iron Beam also could. When it's coming down on it's target it's slowed by the atmosphere and it has no defense other than being fast.