The Navy SEALs and Peshmerga forces were in an armored convoy that was on its way to help pinned down Kurdish forces. Shortly before the video begins the convoy is then halted by an RPG shot to the lead vehicle that then later killed Special Warfare OPerator 1st Class Charles Keating IV, may he rest in Valhalla.
The battle was the largest ISIS offensives since the their initial incursion into Iraq with 122 combatants and over 30 technicals used. 58 combatants were killed and 20 vehicles were taken out by thirty-one airstrikes from eleven American fighters and bombers, including F-15s, F-16s, A-10s, and B-52s, as well as two drones.
https://www.youtube.com/watch?v=XrCMf_vaEzE&feature=youtu.be