"The Pentagon said late Saturday that it had carried out airstrikes in the area and dropped humanitarian aid by plane into Amerli, where the water and electricity had been cut off and residents had resorted to drinking untreated water.
The operation came after days of mounting pressure for the U.S. military to help the beleaguered town, which the United Nations warned faced a “massacre” by the Sunni militants who view Shiites as apostates.
Pentagon officials said the humanitarian airdrop was conducted jointly with Australia, France and Britain, and that U.S. warplanes “conducted coordinated airstrikes against nearby [Islamic State] terrorists in order to support this humanitarian assistance operation.”" LA Times
In answer to the question, we did not learn a lot really. IS still holds the villages all around this place. Increasingly they are doing that in the knowlege that the US won't bomb the towns and that the Iraqis and PM probably don't have the "horsepower" to take them without US and allied air support. They have done the same thing in the area around the Mosul Dam. They still hold all the villages up there.
At Amerli the IS never held the town. The Shia Turkmen successfully defended the town so there was no need for the Iraqi Army and PM to capture the city. The IS were all outside Amerli where they made good targets for airpower. pl