Jihad Mughniyah is buried under the same black marble slab as his father, Imad Mughniyah, the legendary Hezbollah military commander, at a special cemetery created by the Lebanese militia for its “martyrs” in Syria. Life-size posters of both men, dressed in fatigues, stand above it. During a recent trip to Beirut, I counted the number of the graves in the cemetery, a barometer of the price Hezbollah is paying to prop up Syria’s President, Bashar al-Assad. Mughniyah’s grave also reflects the impact of Israel’s quiet but escalating campaign to challenge Hezbollah and Iran in Syria. The younger Mughniyah was a rising Hezbollah star mentored by Iran’s Revolutionary Guards after his father’s death. In 2015, he was killed, in an Israeli airstrike on Syria, along with five other Hezbollah fighters and a general in Iran’s Revolutionary Guard Corps as their convoy neared the village of Quneitra, in the Golan Heights.