This article was originally published by War on the Rocks on 22 June 2015.
Last week, Kurdish forces fighting for the Syria-based Democratic Union Party (PYD) wrested control of the border town of Tel Abyad from the Islamic State. The seizure of the town cut off a key supply line to the Islamic State’s de-facto capital in Raqqa and allowed for the unification of two Kurdish controlled cantons, Kobane and Jazira, between which sits Tel Abyad.
The victory came after the Islamic State nearly defeated PYD forces in Kobane last October, before the dramatic increase in coalition air strikes helped turn the tide of the battle. During the Islamic State’s siege of Kobane, the United States set up a conduit for the PYD to provide targeting data to a military planning office in Erbil, which is then relayed to coalition aircraft. The PYD has since relied heavily on U.S. airpower to aid in their advance and eventual capture of IS-held territory.