BBC: A retired commanding officer has accused Prince Harry of "turning against" his military family after "having trashed his birth family".
In his memoir, the Duke of Sussex describes killing 25 Taliban fighters in Afghanistan as "chess pieces taken off the board".
Ex-colonel Tim Collins said that was "not how you behave in the army".
Prince Harry gives details about his time as a helicopter pilot in Afghanistan in his memoir Spare.
BBC News has obtained a copy of the book after it was put on sale early in Spain. In it, Prince Harry reveals for the first time that he killed 25 enemy fighters - which is perfectly possible after two tours in the Helmand region of the country.
"It wasn't a statistic that filled me with pride but nor did it make me ashamed," he writes.
"When I was plunged into the heat and confusion of battle, I didn't think about those as 25 people. You can't kill people if you see them as people.
"In truth, you can't hurt people if you see them as people. They were chess pieces taken off the board, bad guys eliminated before they kill good guys.
"They trained me to 'other' them and they trained me well."
Responding to the prince's comments, a senior Taliban leader Anas Haqqani tweeted: "Mr Harry! The ones you killed were not chess pieces, they were humans; they had families who were waiting for their return...
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