The attack, which was jointly repelled by Kurdish forces and coalition air strikes, was launched at several locations on the outskirts of the northern Iraqi city of Mosul on Wednesday.
The sites targeted by Daesh included Narwan, Bashiqa and Tal Aswad. Each of the attacks involved up to 120 militants, Pentagon officials said.They added that at least 300 Daesh militants were killed in the fighting that they said continued until Thursday morning.
During the attack, the militants used machine guns, car bombs, rockets and armored bulldozers against Kurdish forces, according to the officials.
Colonel Steve Warren, a US military spokesman, was quoted by the Washington Post as saying that the attack was "the hardest punch ISIL had thrown since this summer."
The newspaper also cited Masrour Barzani, the chairman of the Kurdish region's security council as saying that the past twenty-four hours served as a "grim reminder of why we should not underestimate" Daesh militants.
According to him, the attack also indicated "how badly" Kurdish forces "need more ground support in addition to continued air support."