Michael Weiss and Michael Pregent write: American warplanes have begun bombing the Islamic State-held Iraqi city of Tikrit in order to bail out the embattled, stalled ground campaign launched by Baghdad and Tehran two weeks ago. This operation, billed as “revenge” for the Islamic State (IS) massacre of 1,700 Shiite soldiers at Camp Speicher last June, was launched without any consultation with Washington and was meant to be over by now, three weeks after much triumphalism by the Iraqi government about how swiftly the terrorist redoubt in Saddam Hussein’s hometown was going to be retaken.

U.S. officials have variously estimated that either 23,000 or 30,000 “pro-government” forces were marshaled for the job, of which only slender minority were actual Iraqi soldiers. The rest consisted of a consortium of Shiite militia groups operating under the banner of Hashd al-Shaabi, or the Population Mobilization Units (PMU), which was assembled in answer to a fatwah issued by Iraq’s revered Shiite cleric Ayatollah Ali Sistani in June 2014 following ISIS’s blitzkrieg through northern Iraq. To give you a sense of the force disparity, the PMUs are said to command 120,000 fighters, whereas the Iraqi Army has only got 48,000 troops.

Against this impressive array of paramilitaries, a mere 400 to 1,000 IS fighters have managed to hold their ground in Tikrit, driving major combat operations to a halt. This is because the Islamic State is resorting to exactly the kinds of lethal insurgency tactics which al Qaeda in Iraq (its earlier incarnation) used against the more professional and better-equipped U.S. forces. BuzzFeed’s Mike Giglio has ably documented the extent to which IS has relied upon improvised explosive devices, and just how sophisticated these have been. Even skilled explosive ordnance disposal teams — many guided by Iranian specialists — are being ripped apart by what one termed the “hidden enemy” in Tikrit. [Continue reading…]