NAWA, Afghanistan -- U.S. Marines moved into villages in Taliban strongholds in southern Afghanistan on Friday, meeting little resistance as they tried to win over local chiefs on the second day of the biggest military operation here since the fall of the Taliban government in 2001.

One Marine was killed and several others injured or wounded on Thursday, when some 4,000 Marines launched the operation Helmand province - a remote area that is the center of the country's illegal opium cultivation, which helps finance the insurgency.

So far, however, there has been little resistance from the Taliban, according to a military spokesman Capt. Bill Pelletier.

The aim of the operation is not simply to kill Taliban fighters but to win over the local population, Pelletier said - a difficult task in a region where foreigners are viewed with suspicion.

"We are not worried about the Taliban, we are not focused on them. We are focused on the people," Pelletier said. "It is important to engage with the key leaders, hear what they need most and what are their priorities."

The offensive along 55 miles (88 kilometers) of Taliban-controlled areas in southern Afghanistan will test the Obama administration's new strategy of holding territory to let the Afghan government sink roots in rural areas where Taliban influence is strong.

The insurgency has proven particularly resilient in the area, and foreign troops have never before operated in such large numbers here. Large areas have been under Taliban control, with little or no government presence.

As the operation entered its second day, the units secured control of the district centers of Nawa and Garmser, and negotiated entry into Khan Neshin, the capital of Rig district, Pelletier said.