Taking a page from the successful experiment in Iraq, American commanders and Afghan leaders are preparing to arm local militias to help in the fight against a resurgent Taliban. But along with hope, the move is raising fears here that the new armed groups could push the country into a deeper bloodletting. The militias will be deployed to help American and Afghan security forces, which are stretched far and wide across this mountainous country. The first of the local defense forces are scheduled to begin operating early next year in Wardak Province, an area just outside the capital where the Taliban have overrun most government authority. If the experiment proves successful, similar militias will be set up rapidly across the country, senior American and Afghan officials said. The formation of Afghan militias comes on the heels of a similar undertaking in Iraq, where 100,000 Sunni gunmen, many of them former insurgents, have been placed on the government payroll. The Awakening Councils, as they are known, are credited by American officials as one of the main catalysts behind the steep reduction in violence there. But the plan is causing deep unease among many Afghans, who fear that Pashtun-dominated militias could get out of control, terrorize local populations and turn against the government. The Afghan government, aided by the Americans, has carried out several ambitious campaigns since 2001 to disarm militants and gather up their guns. A proposal to field local militias was defeated in the Afghan Senate in the fall. "There will be fighting between Pashtuns and non-Pashtuns," said Salih Mohammad Registani, a member of the Afghan Parliament and an ethnic Tajik. Mr. Registani raised the specter of the Arbaki, a Pashtun-dominated militia turned loose on other Afghans early in the 20th century. "A civil war will start very soon," he said. The plan for the militias, approved this month by President Hamid Karzai, is being pushed forward anyway, to help stem the deteriorating security situation here. The proposal to field what amounts to lightly trained gunmen reflects the sense of urgency surrounding the fight against the Taliban, who were removed from power after the terrorist attacks of Sept. 11, 2001, but who have staged a remarkable resurgence in recent years. American commanders say that while they would prefer to field Afghan Army and police forces, they are simply not available. "We don't have enough police," said Maj. Gen. Michael S. Tucker, the deputy commander of American forces in the country. "We don't have time to get the police ready." One survey, by the International Council on Security and Development, found that the Taliban had established a permanent presence in 72 percent of Afghanistan, up from 54 percent a year ago. In recent months, the Taliban have moved into the provinces around Kabul, including Wardak to its west. In addition to setting up the first local Afghan militias there, American commanders are sending several hundred American soldiers to the province, the first of which have already arrived. Wardak Province is bisected by the country's national highway, which has been the scene of numerous ambushes of supply convoys by Taliban insurgents. The plan for the militias coincides with the arrival of Gen. David H. Petraeus, who presided over the reduction in violence in Iraq and who has since become overall commander for American forces in Afghanistan and the rest of the region. The Americans are sending 20,000 to 30,000 troops over the next year, in addition to the nearly 70,000 American and NATO troops who are already here. President-elect Barack Obama has declared that he will redouble America's efforts to win. The formation of the militias is at least a partial answer to the question of how American commanders intend to wrest back the initiative from the Taliban over the next 12 months. While some elected officials in the United States have suggested that the Americans and Afghans might try to exploit fissures in the Taliban, possibly breaking off some groups that can be reconciled, the plan for the militias " coupled with the influx of fresh American forces " suggests that American commanders intend to squeeze the Taliban first. American and Afghan officials say they intend to set up local militias of 100 to 200 fighters in each provincial district, with the fighters being drawn from the villages where they live. (Wardak has eight districts.) To help ensure the dependability of each fighter, the Americans and Afghans are planning to rely on local leaders, like tribal chiefs and clerics, to choose the militiamen for them. Those militiamen will be given a brief period of training, along with weapons like assault rifles and grenade launchers, and communication gear, said Abdul Rahim Wardak, the Afghan defense minister. In Iraq, American commanders relied almost exclusively on tribal leaders to put Sunni gunmen at their disposal. But in Afghanistan, 30 years of war has left the tribes scattered and attenuated. American and Afghan leaders say they are instead trying to cobble together councils made up of a wider range of leaders. American and Afghan officials say that they are confident they can keep the militias under control and that they hope the militias can carry out a range of duties, like providing intelligence on Taliban movements that American and Afghan forces can act on. "We don't know when bad people move into town," General Tucker said. "But the local people know. They know everything." One tribal leader from Wardak Province said that while the Taliban were deeply unpopular in his province, people were worried that local militias could make the situation worse. In an interview, Mohammed Naim Haqmal, a leader of the Nuri tribe, said the Taliban controlled about 80 percent of Wardak Province " essentially everything except the centers of each district. At night, Mr. Haqmal said, the Taliban range freely, setting up checkpoints and laying bombs for American convoys traveling on the highway from Kabul to Kandahar. But for all that, Mr. Haqmal said, the Taliban are unpopular in Wardak, mainly because their constant attacks prevent people from leading normal lives. Two months ago, Mr. Haqmal said, a group of local residents in a village called Jajatoo rioted when the Taliban blocked a local road in order to stage an attack on some American forces. Taliban fighters opened fire on the villagers, killing five. "The Taliban want to fight, and that causes problems for the people," Mr. Haqmal said. "People just want to live their lives." Still, Mr. Haqmal said he was skeptical that the government-backed militias could succeed because the Afghan and American officials were bypassing the traditional leaders of the province. So far, he said, they had selected leaders in the community who lacked credibility with the local people. Moreover, Mr. Haqmal said he was worried that the militias would fail to receive proper support and guidance from the government, and end up starting tribal feuds with members of the Taliban. "We already have the Afghan Army and police " they should stick with them," Mr. Haqmal said. A Taliban commander based in Wardak Province, who spoke on the condition of anonymity for fear that he would become a target, predicted that the government militias would find it hard to put down roots in the area, if only because the Taliban had already done so. "We are living in the districts, in the villages " we are not living in the mountains," the Taliban chief said. "The people are with us."