Prince Harry’s Apache helicopter instructor has claimed the Duke was wrong to reveal how many people he killed while in Afghanistan.

The Duke of Sussex went to Afghanistan as an infantryman in 2008, before training as a pilot and returning as an Apache gunner in 2012, when he was 27.

In his memoir Spare, Harry detailed that he had killed 25 Taliban fighters, writing: 'Every kill was on video.

'The Apache saw all. The camera in its nose recorded all. So, after every mission, there would be a careful review of that video.

‘I was part of six missions that ended in the taking of human life, and they were all deemed justified… I deemed them the same.’

The Prince also wrote that he did not think of those killed ‘as people’ but instead ‘chess pieces’ he had taken off the board.

Steve Jones, Harry’s Apache helicopter instructor, criticised the Duke for revealing his kill count, describing the individuals killed as ‘real people’ with families.