When it comes to peace and stability in Iraq, there may be no greater obstacle to success than Anbar province, a vast region of desert and scrubland stretching west from Baghdad.A huge sandy expanse dissected by a major highway, an oil pipeline and the Euphrates river, Anbar has been the bane of U.S. forces almost since they arrived, with its Sunni Arab people virulently opposed to the presence of foreign troops. Despite a small, tribal population, the lawless province is the deadliest in Iraq and the heart of the insurgency hammering at the country.Full Story