Military vehicles of Iraqi security forces make their way on the outskirts of Baiji, north of Baghdad.

American forces are trying to relieve pressure on Iraqi forces at the geographically important Baiji oil refinery, hitting militants with 26 air strikes since Tuesday and helping drop 18 pallets of supplies, the top U.S. general said on Thursday.

Army General Martin Dempsey, chairman of the Joint Chiefs of Staff, told a news conference at the Pentagon that Baiji was an important part of Iraq’s oil infrastructure and also significant because it is on the road from Kirkuk to Mosul, which is occupied by Islamic State of Iraq and Syria (ISIS) militants.

“It actually also sits on a corridor that runs from the Tigris River valley to the Euphrates River valley. And so it’s geographically significant as well as significant economically,” Dempsey said.

Control of the refinery has been hotly contested for months. Iraqi government forces recaptured it from the militants in November, lost control of it again and then recaptured it in April. ISIS militants broke back into the perimeter earlier this week and have been slowly gaining ground.

A Pentagon spokesman said on Wednesday the fight was headed in the wrong direction and the outcome was impossible to predict. Iraqi troops at the refinery that day told Reuters they were low on food and ammunition, and pleaded for reinforcements.

“The Iraqis are under pressure there and have lost some control of the perimeter and some control of the road network that leads to it through the emplacement of … IEDs (improved explosive devices),” Dempsey said.

“We’ve been working with them. We’ve conducted 26 airstrikes since the fifth of May,” he said, adding that a U.S. mobile training team at Baghdad Airport had helped Iraqi forces rig air drops to resupply troops in the refinery.

“Eighteen of 18 pallets landed on the intended target,” Dempsey said.

A Pentagon spokesman said on Wednesday the refinery was not operational and its primary importance at the moment is that it sits astride a route to Mosul, the Iraqi city where ISIS leader last year proclaimed a caliphate to rule over all Muslims.

The spokesman indicated said it was unclear whether Mosul could be recaptured while Baiji remained in the militants’ hands.

Meanwhile, the U.S.-led military coalition launched 14 air strikes in Iraq and four in Syria against ISIS militants since early on Wednesday, the Combined Joint Task Force said on Thursday.

The military statement said strikes in Syria near Al Hasakah involved attack and fighter aircraft. It said the strikes in Iraq involved attack, bomber, fighter and drone aircraft and were near Al Huwayjah, Baiji, Fallujah, Kirkuk, Mosul, Sinjar and Tal Afar.

The strikes all took place between 8 a.m. on Wednesday and 8 a.m. on Thursday local time, the statement said.

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