US forces swept through ravines and open desert on the northern banks of the Euphrates in their hunt for insurgents, in an area near the Syrian border said to serve as a staging post for Iraq’s most wanted man, Abu Musab al-Zarqawi. Operation Matador, the largest US combat engagement this year, involved a regimental size unit of about 1,000 men sweeping through areas of Al Anbar province, in the northwest of the country, a US military spokesman said Tuesday.Full Story