On Dec. 22, 2006, American military officials in Baghdad issued a secret warning: The Shiite militia commander who had orchestrated the kidnapping of officials from Iraq’s Ministry of Higher Education was now hatching plans to take American soldiers hostage.

What made the warning especially worrying were intelligence reports saying that the Iraqi militant, Azhar al-Dulaimi, had been trained by the Middle East’s masters of the dark arts of paramilitary operations: the Islamic Revolutionary Guards Corps in Iran and Hezbollah, its Lebanese ally.

“Dulaymi reportedly...]]>