Round one occurred on Feb. 10, when an Iranian drone launched by a Revolutionary Guards Quds Force unit operating out of Syria’s T4 air base, east of Homs in central Syria, was shot down with a missile from an Israeli Apache helicopter that was following it after it penetrated Israeli airspace. “This is the first time we saw Iran do something against Israel — not by proxy,” a senior Israeli military source told me. “This opened a new period.” It certainly helps to explain why Israeli jets launched a predawn missile raid on the Iranian drone’s T4 home base last...