U.S. air strikes since Friday have opened a corridor through which tens of thousands of Yazidis, trapped and starving on a mountain in Iraq, have escaped to safety in Kurdistan. The Kurds, whose peshmerga fighters were sent reeling by the Islamic State last week, bolstered now by the arrival of U.S. air power, recaptured two towns. But the peshmerga have apparently lost the strategically important town of Jalawla, 20 miles from Iran, the furthest east that ISIS forces have penetrated. Last week's gains by the Islamic State caused Republican hawks to flock to the Sunday talk shows. "ISIS is...