The early hours of the morning of Nov. 24 began with a boom. The Israeli Air Force was hitting targets here in the Gaza Strip, shattering the pre-dawn quiet of this besieged coastal enclave.

Someone had shot a rocket over the Israeli separation barrier. Was it Hamas? Or Islamic Jihad? Was this the beginning of a new war?

Nope. Although no one claimed responsibility, the culprits almost certainly were from a small group calling itself the Sheikh Omar Hadid Brigade (SOHB), the affiliate in Gaza of the so-called Islamic State, or ISIS. […]