The Deir ez-Zor offensive (April–July 2014) was launched by the Islamic State (ISIS) against all other opposition forces in the Deir ez-Zor Governorate as part of the inter-rebel conflict during the Syrian Civil War.
After more than three months of heavy fighting, ISIS totally defeated the rebels and captured almost the whole province, except a part of the provincial capital, the military airport on its southern outskirts and a few of the surrounding towns, which remained under control of Syrian government troops, who were not involved in the inter-rebel fighting.
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