» ISIL militants with more than 20 vehicles attack a Peshmerga position near the town of Tel Skuf, north of Mosul, where a dozen U.S. troops are acting as advisors. The militants break into the position using three truck bombs followed by bulldozers to clear the wreckage away.
» The Peshmerga and U.S. forces call for a Quick Reaction Force (QRF) to respond and help personnel withdraw from Tel Skuf. The QRF includes about a dozen U.S. aircraft: F-15s, F-16s, A-10s, B-52s, and two drones carry out 31 airstrikes which destroy two more truck bombs. Together, the coalition forces repel the attack.
» The battle for Tel Skuf continues for another 12 hours, killing 58 militants and capturing three ISIL mortars and 20 vehicles. Peshmerga forces capture three Humvees that ISIL had captured from the Iraqi military in 2014. Special Warfare Operator 1st Class Charles Keating IV, a U.S. Navy SEAL who was part of the QRF, is the third American serviceman to be killed in combat during Operation INHERENT RESOLVE. Ten Peshmerga fighters are killed and 30 wounded. Two U.S. medevac helicopters are damaged by small arms fire.
» It emerges that the Tel Skuf attack is part of an ISIL counter-offensive on multiple fronts. Near Tel Skuf, ISIL destroys a Peshmerga checkpoint. Iraqi special forces foil an attack by five suicide bombers in the village of Khirbirdan. Peshmerga forces repel an ISIL assault on Wardak. Coalition aircraft carry out seven airstrikes near Mosul, hitting six groups of ISIL fighters as well as two vehicles, three weapons caches, a mortar system, and other targets. The offensive is one of the most complex battlefield operations launched by ISIL since December 2015. It fails.
» ISIL executes 17 civilians in Mosul by firing squad for refusing to fight for the Caliphate.