<p>HUSAYBAH, Iraq — Six Marines were killed and scores of insurgent Iraqis slain in a fierce 14-hour battle Saturday between Marines and mujahedeen fighters who slipped into this town near the Syrian border.</p>
<p>According to Marines, an estimated 300 Iraqis from Fallujah and Ramadi launched an assault against the Americans in Husaybah around 8 a.m., beginning with a roadside bombing and a flurry of 24 mortars.</p>