Fresh details of the revelations in the yet to be officially released memoir of have been made public after a number of book shops in Spain put the book on shelves days early.
In it, details about Harry's relationship with his father, , his elder brother, Prince William, and other members of the British royal family that have never previously been published.
A Reuters reporter was among those able to get a Spanish-language version of the book titled 'Spare', which included the details published by the Guardian on Wednesday that talked about Prince William knocking his brother to the floor during a heated argument.
As is usual for the royal family, spokespeople for Charles and William have declined to comment.
Objections to Camilla Parker-Bowles
Harry wrote that he and Prince William had asked their father not to marry Camilla Parker-Bowles, who is now Britain's queen consort.
She's now the Queen Consort but Prince Harry's memoir said both Harry and William asked their father not to marry her. Credit: Hagen Hopkins/Getty Images
"Despite the bitterness and sadness we felt in closing another loop in the history of our mother, we understood this was irrelevant."
Princess Diana
The book outlines how Prince Harry met a woman with "powers" who said she could feel Princess Diana's spirit.
He wrote that the woman was recommended by friends and that, while he had his doubts about her, as soon as he sat down "I felt an energy around her".
Royal well-wisher John Loughrey holds a photograph of Princess Diana outside Kensington Palace, the former home of Princess Diana in London on 31 August 2022. Source: AAP / Andy Rain
Military service in Afghanistan
Prince Harry was a helicopter pilot in the British Army.
Harry wrote that while participating in six missions, he killed 25 people.
He said he saw the deaths as 'justifiable' as Taliban insurgents wanted to kill his comrades.
"It wasn't a statistic that filled me with pride but nor did it leave me ashamed. When I found myself plunged in the heat and confusion of combat I didn't think of those 25 as people. They were chess pieces removed from the board, Bad people eliminated before they could kill Good people."
Drug use, Nazi costume
Harry wrote that when he was 17 he was offered a line of cocaine at someone's house and consumed the drug on several other occasions, although he insists media reports suggesting he was a drug addict were false and that he did not enjoy it.
"It wasn't much fun and it did not make me feel especially happy as it seemed to do to everyone else, but it did make me feel different, and that was my main objective. I was a 17-year-old boy ready to try anything that altered the pre-established order," the book said.
Harry also recounted how, as a student at the exclusive Eton College, he used to smoke cannabis in a bathroom at his house while the Thames Valley police served as his bodyguards, patrolling the exterior of the building.
Of the now infamous Nazi costume he wore to a fancy dress party in 2005, Harry said he was encouraged by Prince William and his wife Kate to wear the outfit.
Copies of German tabloids featuring the story of Prince Harry attending a party dressed in a Nazi uniform in 2005. Source: Getty / Sean Gallup
Paternity questions
Harry dismissed media rumours that he was the result of an affair between Major James Hewitt and his mother Princess Diana and suggestions that his father had often joked about not knowing who Harry's real father was.
Harry wrote that the idea was absurd, given that his mother did not meet Major Hewitt until long after he was born.
Marriage to Meghan Markle
Harry claimed the royal household dragged its feet over the date and venue for his wedding with Meghan Markle.
He said when he consulted his brother about the possibility of marrying in Westminster Abbey or St. Paul's Cathedral, William said he could not marry there because they had been venues for the weddings of Charles and Diana and of William and Kate respectively.
Prince Harry and Meghan Markle. Source: AAP
Lighter moments
While most of the details within the book cover serious matters, a recollection about Prince Harry's trip to the North Pole was one of the few lighter moments to come from the book.
He suffered from early stages of what appears to be frostbite, including to his penis and recounted telling his father about his injuries at a dinner on the eve of William's wedding.
"My father showed interest and sympathised with me when I mentioned that my ears and cheeks had burned due to the cold. I struggled to contain myself to not talk too much and tell him that my penis had also been affected..."
The memoir's early release
The official release date for the book is January 10.
A spokesperson for the Spanish publisher, Barcelona-based Plaza y Janes Editores - which belongs to multinational conglomerate Penguin Random House - said: "A very clear launch protocol was established and communicated to all customers so that the book would not be marketed before that date.
"Everything points to the fact that some customers have breached their commitment to the publisher and have put the book on sale before the agreed date."
