FINALLY. This is how you take a city, at least in this scenario. You encircle it. Notice how, for months, the Turks tried full frontal assault after full frontal assault, and each time, ISIS, just sat there and killed them. Then the Turks move on Bzaa (the northern prong), and Assad gains fire control over the supply route from the south (that's the other prong), and all the Daesh in their snipers nests realize they're about to get cut off and high tail it back to Raqqa.