Over the next five-and-a-half years in the notorious Hoa Loa Prison he was regularly tortured and mistreated.
It was in 1969 that Carol went to spend the Christmas holiday â her third without McCain â at her parentsâ home. After dinner, she left to drop off some presents at a friendâs house.
It wasnât until some hours later that she was discovered, alone and in terrible pain, next to the wreckage of her car. She had been hurled through the windscreen.
After her first series of life-saving operations, Carol was told she may never walk again, but when doctors said they would try to get word to McCain about her injuries, she refused, insisting: âHeâs got enough problems, I donât want to tell him.â
H. Ross Perot, a billionaire Texas businessman, future presidential candidate and advocate of prisoners of war, paid for her medical care.
When McCain â his hair turned prematurely white and his body reduced to little more than a skeleton â was released in March 1973, he told reporters he was overjoyed to see Carol again.
But friends say privately he was âappalledâ by the change in her appearance. At first, though, he was kind, assuring her: âI donât look so good myself. Itâs fine.â
He bought her a bungalow near the sea in Florida and another former PoW helped him to build a railing so she could pull herself over the dunes to the water.
âI thought, of course, we would live happily ever after,â says Carol. But as a war hero, McCain was moving in ever-more elevated circles.
Through Ross Perot, he met Ronald Reagan, then Governor of California. A sympathetic Nancy Reagan took Carol under her wing.
But already the McCainsâ marriage had begun to fray. âJohn started carousing and running around with women,â said Robert Timberg.
McCain has acknowledged that he had girlfriends during this time, without going into details. Some friends blame his dissatisfaction with Carol, but others give some credence to her theory of a mid-life crisis.
He was also fiercely ambitious, but it was clear he would never become an admiral like his illustrious father and grandfather and his thoughts were turning to politics.
In 1979 â while still married to Carol â he met Cindy at a cocktail party in Hawaii. Over the next six months he pursued her, flying around the country to see her. Then he began to push to end his marriage.
Carol and her children were devastated. âIt was a complete surprise,â says Nancy Reynolds, a former Reagan aide.
âThey never displayed any difficulties between themselves. I know the Reagans were quite shocked because they loved and respected both Carol and John.â
Another friend added: âCarol didnât fight him. She felt her infirmity made her an impediment to him. She justified his actions because of all he had gone through. She used to say, âHe just wants to make up for lost time.ââ
Indeed, to many in their circle the saddest part of the break-up was Carolâs decision to resign herself to losing a man she says she still adores.
Friends confirm she has remained friends with McCain and backed him in all his campaigns. âHe was very generous to her in the divorce but of course he could afford to be, since he was marrying Cindy,â one observed.
McCain transferred the Florida beach house to Carol and gave her the right to live in their jointly-owned townhouse in the Washington suburb of Alexandria. He also agreed to pay her alimony and child support.
A former neighbour says she subsequently sold up in Florida and Washington and moved in 2003 to Virginia Beach. He said: âMy impression was that she found the new place easier to manage as she still has some difficulties walking.â
Meanwhile McCain moved to Arizona with his new bride immediately after their 1980 marriage. There, his new father-in-law gave him a job and introduced him to local businessmen and political powerbrokers who would smooth his passage to Washington via the House of Representatives and Senate.
And yet despite his popularity as a politician, there are those who wonât forget his treatment of his first wife.
Ted Sampley, who fought with US Special Forces in Vietnam and is now a leading campaigner for veteransâ rights, said: âI have been following John McCainâs career for nearly 20 years. I know him personally. There is something wrong with this guy and let me tell you what it is â deceit.
âWhen he came home and saw that Carol was not the beauty he left behind, he started running around on her almost right away. Everybody around him knew it.
âEventually he met Cindy and she was young and beautiful and very wealthy. At that point McCain just dumped Carol for something he thought was better.
âThis is a guy who makes such a big deal about his character. He has no character. He is a fake. If there was any character in that first marriage, it all belonged to Carol.â
One old friend of the McCains said: âCarol always insists she is not bitter, but I think thatâs a defence mechanism. She also feels deeply in his debt because in return for her agreement to a divorce, he promised to pay for her medical care for the rest of her life.â
Carol remained resolutely loyal as McCainâs political star rose. She says she agreed to talk to The Mail on Sunday only because she wanted to publicise her support for the man who abandoned her.
Indeed, the old Mercedes that she uses to run errands displays both a disabled badge and a sticker encouraging people to vote for her ex-husband. âHeâs a good guy,â she assured us. âWe are still good friends. He is the best man for president.â
But Ross Perot, who paid her medical bills all those years ago, now believes that both Carol McCain and the American people have been taken in by a man who is unusually slick and cruel â even by the standards of modern politics.
âMcCain is the classic opportunist. Heâs always reaching for attention and glory,â he said.
âAfter he came home, Carol walked with a limp. So he threw her over for a poster girl with big money from Arizona. And the rest is history."
Brutal
