Syrian rebels, recently trained by the U.S. military, came under heavy fire Friday in northern Syria and for the first time called in U.S. airstrikes to repel the enemy.
U.S. military officials tell NBC News the Free Syrian forces were attacked Friday morning by about 50 al Nusra fighters. Under siege, the Syrian moderates issued a desperate plea to the U.S. military.
American warplanes quickly responded, launching airstrikes driving away the enemy forces. U.S. officials would not provide the number of U.S.-trained Syrian rebels or the location of today's attack.