Last weekend, Army Delta Forces commandos took off from Iraq and slipped across the border into Syria. After touching down they came under fire and the battle escalated into hand-to-hand combat.
The fight eventually left about a dozen ISIS fighters dead, including a man known as Abu Sayyaf. He was the raid's target because he was an ISIS money man who helped spearhead the militant group's lucrative black market oil, gas and financial operations.
Derek Harvey tells Here & Now's Jeremy Hobson more about Sayyaf and why U.S. military personnel were put on the ground to attack and kill him.
This segment aired on May 19, 2015.