Hundreds of US, British and French military advisers have arrived in Cyrenaica, Libya's eastern breakaway province, military sources report exclusively. This is the first time America and Europe have intervened militarily in any of the popular upheavals rolling through the Middle East since Tunisia's Jasmine Revolution in early January.  The advisers, including intelligence officers, were dropped from warships and missile boats at the coastal towns of Benghazi and Tobruk Thursday Feb. 24, for a threefold mission: