Pakistan has vowed to eliminate militants from Swat and two neighboring districts under intense American pressure for action against extremists threatening both nuclear-armed Pakistan and neighboring Afghanistan.
The military claimed Friday that militants were shaving off their beards and cutting their hair - flowing locks were fashionable among the Swat Taliban - in order to mingle with the refugees pouring out of the valley and escape.
It appealed to the civilians to point out any militants among them to security forces, and even issued a mobile phone number so people could pass on anonymous tips.
But an e-mailed army statement also said militants had mounted a counterattack, and that three soldiers were killed and 11 wounded in various clashes over the previous 24 hours.
The Swat operation is a key test of Pakistan's will and ability to roll back the advance of homegrown Taliban militants, who last month seized a district just 60 miles from the capital, Islamabad, under cover of a since-abandoned peace process.
The army says it is advancing slowly in an attempt to avoid civilian casualties. Public opinion appears to support the offensive. But analysts say the mood will quickly sour if the fighting drags and civilian hardship mounts.
According to the United Nations, more than 900,000 people have already abandoned the area amid escalating clashes, which the army says has left more than 800 militants and dozens of troops dead.
Some 80,000 refugees have moved into sweltering camps set up by the government and the United Nations, most of them near Mardan.
Earlier this week, Lt. Gen. Nadeem Ahmed, the man who led the military's effort to provide relief to victims of the 2005 earthquake, was appointed to head a newly formed military support group for Swat Valley refugees, CBS News' Farhan Bokhari.
The group will be responsible for coordinating emergency assistance for 1.3 million people displaced from Swat Valley.
In the latest exodus, columns of cars, trucks and horse-drawn carts packed with people and laden with bundles of possessions streamed out of Mingora after the army lifted its curfew for eight hours.
Television images showed some edging past the carcasses of burned-out vehicles that failed to make it to safety. Others opted for rough dirt roads through the fields and mountains. Many more were hurrying south on foot with no more than the clothes on their backs.