initially the sons of the tribes gave up thinking isis was better than the baghdad government but they turned on the tribal members, so the sheikhs are furious about this. they want to take tikrit back. yesterday, they took back the police academy, by we built there in 2007. so this becomes a psychological battle. >> tikrit is the hometown of former iraqi leader saddam hussein. 30 years ago iraq was fighting a bitter war against its neighbor iran. but now an iran general is helping iraqi forces take on isis. michael holmes has more on the mysterious military leader from tehran. >> reporter: he's known as the