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Iraqi pro-government forces, including fighters from the Shiite Muslim Al-Abbas popular mobilisation unit, take part in an operation to retake the Baiji oil refinery from Islamic State (IS) group jihadists, on April 15, 2015. The refinery -- some 200 kilometres (120 miles) north of Baghdad -- once produced some 300,000 barrels of refined products per day, meeting half the country's needs. AFP PHOTO / MOHAMMED SAWAFMOHAMMED SAWAF/AFP/Getty Images
Iraqi pro-government forces, including fighters from the Shiite Muslim Al-Abbas popular mobilisation unit, take part in an operation to retake the Baiji oil refinery from Islamic State (IS) group jihadists, on April 15, 2015. The refinery -- some 200 kilometres (120 miles) north of Baghdad -- once produced some 300,000 barrels of refined products per day, meeting half the country's needs. AFP PHOTO / MOHAMMED SAWAFMOHAMMED SAWAF/AFP/Getty Images

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Iraqi oil refinery the site of 'apocalyptic' battle

Iraqi troops did battle with ISIS at an oil refinery in an attempt to drive them out of the area. CNN's Nick Paton Walsh reports.

Iraqi oil refinery the site of 'apocalyptic' battle

Iraqi troops did battle with ISIS at an oil refinery in an attempt to drive them out of the area. CNN's Nick Paton Walsh reports.