Battle over Syria's Aleppo nears

Syrian boys sit on a street after an airstrike July 9 in the northern city of Aleppo. / Fadi Al-Halabi, AFP/Getty Images GAZIANTEP, Turkey - After more than three years of civil war in Syria, government troops are advancing to retake Aleppo, the country's largest city, and possibly deliver a crushing blow to the rebellion against the regime of President Bashar Assad