"A contingent of U.S. Special Forces was caught up in Turkish shelling against U.S.-backed Kurdish positions in northern Syria, days after President Donald Trump told his Turkish counterpart he would withdraw U.S. troops from certain positions in the area. "A senior Pentagon official said shelling by the Turkish forces was so heavy that the U.S. personnel considered firing back in self-defense." Exclusive: Turkey attacks US special forces in Syria, apparently by mistake Is it possible Trump did not realize he was giving Erdogan a green light to invade northern Syria? Is it (more) likely some of Turkey's Arab militia fighters believe they have a score to settle with the US? What happens if a US soldier dies from a NATO ally's American-made weapons?