The Tishrin Dam Offensive: 23 December-30 December 2015
The Tishrin Dam offensive was the last battle waged by the Syrian Democratic Forces (QSD) in 2015: https://en.wikipedia.org/wiki/Tishrin_Dam_offensive
Here is small video of QSD getting the power-generating dam up and running: https://www.facebook.com/1814267612131127/videos/1951497661741454/?theater
