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Elizabeth Smart recalled how she was raped, forced to drink alcohol and chained "like an animal" in graphic testimony in the trial of the man who abducted her eight years ago.

Smart, now 23, told a Salt Lake City jury on Monday that she awakened to the feeling of a cold knife at her neck and a voice that threatened her.

"I was shocked. I thought I was having a nightmare. It was just indescribable fear," Smart told jurors Monday on the first day of testimony in the federal trial of Brian David Mitchell, the man accused of kidnapping her in June 2002.

As the then 14-year-old lay in bed alongside her baby sister, the man repeated: "Don't make a sound. Get out of bed and come with me, or I will kill you and your family." She was his hostage, he told her.

That night eight years ago, they fled up the hills above her home, with Smart in her red pajamas and tennis shoes, and the knife to her back.

Her younger sister -- a baby blanket wrapped around her head and neck -- rushed to their mother, telling of the kidnapping.

"It was utter terror," their mother, Lois Smart, testified earlier Monday. "It was the worst feeling, knowing that I didn't know where my child was. I was helpless."

Nine months later, motorists spotted Elizabeth Smart walking in a Salt Lake City suburb with Mitchell.

Smart testified Tuesday that on the day police finally found her, she lied to them about her identity out of fear her abductor would kill her. She told them she was Augustine Marshall, the daughter of traveling preachers. She says that was the story Mitchell directed to her to tell if ever anyone approached her.

But Smart says she was also thinking her ordeal was finally coming to an end.

Mitchell's attorneys did not dispute the facts of the abduction. But during opening statements, they said the prosecution's allegation that he was a calculating person who planned the kidnapping was wrong.

Known as a homeless street preacher named "Immanuel," Mitchell was influenced by a worsening mental illness and religious beliefs that made him think he was doing what God wanted, his attorneys said.

Mitchell, who has a long graying beard to the middle of his chest and hair to the middle of his back, was again removed from the courtroom Monday for singing hymns, so he's watching and listening from a holding cell.

Smart testified about the day a police officer nearly rescued her, months after she was kidnapped from her bedroom at the age of 14.

She says a police detective in Salt Lake City tried to see behind her veil at a library table, but backed down when Brian Mitchell told him that her face was hidden for religious reasons.

Smart says after the officer left, she was mad at herself for not saying anything to him. She says she "felt terrible that the detective hadn't pushed harder and had just walked away."

She also testified about a party that Mitchell had taken her to, at the invitation of a grocery store clerk he had befriended. She says when the clerk tried to talk to her, Mitchell told him that she was his daughter, and that she couldn't talk to him.

Smart's mother testified that she and her children ran into Mitchell downtown and that she offered him a job doing handyman work at the family's home. One of her sons encouraged her to give him money, she said.

"He looked like a clean-cut, well-kept man that was down on his luck," she said. "I gave him $5."

Later, the family hired Mitchell to help fix a leaky roof, Lois Smart said. It was the only job he did for the family.

"I do remember having a conversation with him, hoping that he would do more work. He seemed fine," she said.

Elizabeth Smart described how Mitchell came into her bedroom. She had left a kitchen window open because her mother had burned potatoes for dinner.

"I remember him saying that I have a knife to your neck, don't make a sound, get out of bed and come with me or I will kill you and your family," she said.

Smart said she got up and he grabbed her arm, and took her into a closet. He stopped her when she reached for slippers and told her to wear tennis shoes.

After leaving the house, Smart said, they hiked three to five hours up a dry streambed and over a mountain to a campsite. As they made their way, the man shed the stocking he used to cover his face. And she remembered him as the carpenter.

"The name Immanuel just came to me," Smart said.

At the campsite, Mitchell's now-estranged wife, Wanda Eileen Barzee, embraced Smart, took her into a tent, sat her down on a bucket and washed her feet.

Barzee also told her to take off her pajamas and underwear and put on a robe or "she would have the defendant come in and rip them off," she said.

Smart said Mitchell entered the tent wearing a similar robe and married them by twisting lines from a Mormon religious rites into a marriage ceremony, known as sealing.

"He said, 'What I seal on this earth will be sealed to me in the hereafter and I take you to be my wife,"' she said, adding that she screamed and he threatened to put duct tape across her mouth.

"He proceeded to fight me to the ground and force the robes up," Smart said quietly, pausing, "where he raped me."

"I begged him not to. I did everything I could to stop him. I pleaded with him not to touch me, but it didn't work."

Mitchell shackled her ankle to a heavy metal cable, which was attached to a cable strung between two trees, making it impossible for her to flee, she said. She was tethered for about six weeks, despite promising Mitchell that she would not run away.

Lois Smart said she was awakened by daughter Mary Katherine, who was 9 at the time and slept in the same room as Elizabeth. With the baby blanket wrapped around her head, she looked like "a scared rabbit," her mother said.

"She said a man has taken Elizabeth with a gun and that we won't find her. He took her either for ransom or hostage," Lois Smart recalled Mary Katherine, now 18, saying.

Lois Smart said she went to the kitchen and immediately noticed the window was open and the screen was cut in a U-shape.

"My heart sank," she said. Then, she yelled to her husband, Ed: "Call 911. She's gone."'

The morning after the kidnapping, Smart said she cried and Mitchell explained to her that he had been planning the abduction since first meeting the family. "He said that I was very lucky, that I had been called by God to be his wife," she said.

Then, she said, she decided to try to survive. "No matter what it took, I was going to live," she said.

Elizabeth Smart is serving a French mission for The Church of Jesus Christ of Latter-day Saints, but plans to resume her music studies at Brigham Young University next year.

Mitchell, 57, faces life in prison if he is convicted of kidnapping and unlawful transportation of a minor across state lines with the intent to engage in criminal sexual activity. He is accused of taking Smart to California.

A parallel state case, where he is charged with aggravated kidnapping and aggravated sexual assault, stalled after he was twice deemed incompetent to stand trial. A state judge declined to order forced psychiatric treatment.

Mitchell, however, was ruled competent for a federal trial.

The Associated Press contributed to this report