Shiite cleric Muqtada al-Sadr is establishing a new fighting force to battle U.S.-led troops in Iraq, he said in a letter read in Iraqi mosques Friday. Al-Sadr’s letter said that “the resistance will be exclusively conducted by only one group. This new group will be defined soon by me.” Al-Sadr’s militia, the Mehdi Army, has a strong and ubiquitous presence in Shiite cities, towns and neighborhoods. Full Story