This war has been something like one of those goofy "pro" wrestling matches where you load a bunch of people into the ring and everyone fights everyone else, with alliances constantly shifting, and so on. In this case, with a few exceptions, for the most part Assad has not been fighting ISIS, and those two sides have not even been physically placed to engage directly in most instances.
The heavy lifting against ISIS has been mainly done by the Kurds, with US assistance.
“This war has been something like one of those goofy “pro” wrestling matches where you load a bunch of people into the ring and everyone fights everyone else, with alliances constantly shifting, and so on.”
The mass of ISIS fighters is currently camped out in the Kurdish section of Syria on the Iraq border, with the United States guarding the Euphrates crossing around Dier Ez-Zor.
Makes you wonder why ISIS would flee into an area controlled by the Kurds and exactly what the US military is doing about it, besides preventing pro-Assad elements from going after them.