As fighting continued between Iraqi security forces and Shiite militia fighters in the oil-rich port city of Basra, Prime Minister Nouri al-Maliki gave an ultimatum Wednesday for gunmen to lay down their arms and forsake violence by week's end.

ABC News correspondent Martha Raddatz talks about her new book, "The Long Road Home," which details the April 4, 2004 battle between U.S. troops and Iraqi militants in Sadr City, widely considered to be the beginning of the violent insurgency…