A former child fighter sits under a portrait of a father with his children at a transit home for demobilized child soldiers Feb. 19 in Goma, Congo.

Kiwanja, Congo ? Some beat their heads against the wall until doctors inject them with tranquilizers. Others remain mute for days, their eyes darting around like frightened animals.

In recent weeks, hundreds of child soldiers in eastern Congo’s catastrophic war have returned home, sometimes to the same villages where they killed and pillaged. Some have been forced back out with threats of vengeance, and even ostracized by their own families.

These children were kidnapped by rebels and used as fighters, laborers, porters and sex slaves in a war that has torn the mineral-rich region apart for years. Children helped slaughter some 150 civilians in a two-day massacre in Kiwanja in November, one of the latest atrocities in a relentless cycle of ethnic warfare.

But in January, President Joseph Kabila invited troops in from neighboring Rwanda to help end the conflict. Rebel leader Laurent Nkunda was arrested and his fighters integrated into the army — and child advocates are seizing upon the relative stability to persuade militias and rebels to let go of those under 18. At least 478 children, including 15 girls, were demobilized in eastern Congo in January and February, according to UNICEF.

Stripped of their camouflage uniforms, guns and machetes, many of the youngsters still have raw aggression programmed into them through years of being pumped up with drugs and thrown into battle. Some have scars on their arms from knife cuts where herbs and other concoctions were rubbed under the skin to convince them that bullets would ricochet off their bodies.

Aid workers took an Associated Press reporter to speak to some demobilized child soldiers on condition that no questions be asked that might upset them. Their names are being withheld to protect their identities and to avoid reprisals.

Aid workers say child soldiers have been programmed to lie by the militias and rebels — about their ages, names, where they are from and how they were recruited.

Four of them described how they willingly joined the Mai-Mai Patriotic Resistance a month before the Kiwanja massacre. The former child fighters say they were between 15 and 17 and were in their fourth year of school.

“Our land was invaded, so we were obliged to fight. We decided to go and fight together,” said one, a teenager wearing new white tracksuit pants who taps one knee up and down nervously.

His friend said he was encouraged by his parents to fight.

Joseph N. Giza, who works with the Congolese group Heal Africa, said that was not unusual: “Can you imagine? Sending your children to a war you are busy running away from? The children were used as cannon fodder. We have found some as young as 10 years old.”

Aid workers, though, say they have a lot of hope the former child soldiers can be rehabilitated, noting that many are able to recover relatively quickly — returning to normal family life and going back to school.

Since 2004, more than 30,000 children across the country have been demobilized and reintegrated with assistance from UNICEF. But it is estimated that around 3,500 children are still with armed groups in Congo.

A child protection officer, who spoke on condition of anonymity for fear of reprisals, is helping set up community groups and persuading them to accept back the child fighters.

“Before we reunite the children, we go to the parents and communities,” she said. “We explain that these are just children who have been manipulated by adults, that they did not understand what they were doing. What they need is a lot of love and attention.”

But dozens of youngsters returned home to face death threats. They’ve fled to a transit home for child soldiers in Goma, run by Concerted Action for Disadvantaged Youth and Children with money and expertise provided by the U.N. Children’s Fund.

Fidele Rutabagisha, director of the Congolese group, said that since Jan. 20 they have reunited 360 youngsters with their families but 35 have returned, fearing for their lives.