Prince Harry has revealed details about his life, relationships with his family, past loves but he has also talked about two of the times he spent in Wales while training to be an officer in the Blues and Royals. On one of the occasions an ambulance even needed to be called to a field in the Welsh countryside so he could have medical treatment for a serious foot injury.
During his 10 years in the Army, the Duke who was known by his surname Wales undertook two operational tours of duty in Afghanistan and qualified as an Apache Aircraft Commander. See what Prince Harry actually wrote about killing 25 Taliban fighters in full.
Prince Harry entered Royal Military Academy Sandhurst in May 2005 to begin 44 weeks of Officer Cadet training, and part of that training was carried out in some very difficult conditions in Wales.
He has reminisced about learning bayoneting on a cold, wintry morning at the Castlemartin Training Area in Pembrokeshire, where he said he saw the "dark side of human nature".
On another trip at the height of summer in the mountains of Wales, he developed trench foot and nearly had to give up on a training hike eight miles from the finish line. An ambulance was even called, and he described in the tell-all memoir how a Colour Sergeant persuaded him to not give up and he carried on in agony to the end.
The Castlemartin Training Area provides essential training for soldiers, and it was there that Prince Harry learnt bayoneting skills.
He described the morning in the book saying: ""The colour sergeants put on head-splitting punk rock music, full volume, to rouse our animal spirits, and shouting: KILL! KILL! KILL!
"When the whistles blew, when the drill was "over", some guys couldn't turn it off. They kept stabbing and stabbing their dummies . A quick glimpse into the dark side of human nature. Then we all laughed and pretended we hadn't seen what we'd just seen."
In another extract of Spare, that was released in the UK last week, he described his experiences of a strenuous hike in the Welsh countryside on one of the warmest days of the year.
He wrote: "In the late summer we were shipped to Wales and put through a punishing exercise called Long Reach. A nonstop march, yomp and run over several days, up and down barren countryside, with a load of gear strapped to our back, equivalent to the weight of one young teenager. Worse, Europe was suffering a historic heat wave, and we set out at the crest of the wave, the hottest day of the year.
"A Friday. We were told that the exercise would run through Sunday night."
During the weekend, the Welsh weather turned and they got caught in a thunderstorm.
He writes in the book: "Late Saturday, during our only enforced rest, we slept in bags on a dirt track. After two hours were were awakened by thunder and hard rain, drinking the drops. It felt so good, But then we were wet. And it was time to march again.
"Sopping wet, in driving rain, marching now became something altogether different. We were grunting, panting, growling, slipping. Gradually I felt my resolve start to give way.
"At a momentary stop, a checkpoint. I felt a burning in my feet. I sat on the ground, pulled off my right boot and sock, and the bottom of my foot peeled away.
"Trench foot. The soldier beside me shook his head . Shit. You can't go on.
"I was gutted. But, I confess, also relieved."
An ambulance was called and Prince Harry remember "staggering" towards it, and the medics telling him the march was over after an examination.
But, a sergeant "who normally shouted at me", took him aside and urged him to carry on because there were only six to eight miles left. He listened and decided to carry on, taping his foot up with zone oxide tape, wrapping his feet and ramming them into his boots.
He described those last miles as "agony", saying they were some of the worst steps he had ever taken. This is how he described it in the book: "The last four miles were among the most difficult steps I've ever taken on this planet. As we crossed the finish line I began to hyperventilate with relief."
After the hike, he said they shuffled around the barracks "like old men", but added "proud old men" and he thanked the Colour Sergeant who made him carry on.
In January 2006, Clarence House announced he was to join the Blues and Royals, after which he was commissioned as an Army officer on 12 April that year.
In 2007, Harry was deployed to Afghanistan for 10 weeks, working as a forward air controller, co-ordinating airstrikes on Taliban positions.
Prince Harry has accused some journalists of spreading a "dangerous lie" that he boasted about killing 25 Taliban fighters. The Duke of Sussex told a US interviewer that the British press had "stripped away" the context in its coverage of his new memoir Spare.
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