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A touching exchange between Prince Harry and a U.S. soldier was captured on camera at the Invictus Games, a Paralympic-style multi-sport event for wounded warriors from around the world.

After Prince Harry presented Army Sgt. Elizabeth Marks with a gold medal for winning the 100-meter freestyle swimming event, she returned the medal and asked him to donate it to a British hospital that saved her life.

Marks was treated at Papworth Hospital in Cambridge in 2014. She was due to compete in the first Invictus Games in London but collapsed with a serious lung condition and was put on life support for ten days.

"They absolutely saved my life and I can't thank the U.K. enough for having that kind of medical support and taking such good care of me," Marks said. "So I gave Prince Harry one of my medals and hope it will find its way back to Papworth."

Marks joined the Army at 17. She suffered a serious hip injury in 2010, which left her with no sensation in her left leg, but she has since come back fighting and still serves in the military.

She won all four swimming events she entered at the Invictus Games.

"Thank you, I'll never be able to repay you, but what you're doing is wonderful," Marks said. "It's just an honor to be here and stand next to all the other soldiers, I can't think of anywhere else I'd rather be."

Watch more above.

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