Blunt, a former cavalry officer in the British Army, was leading a NATO column under order to seize the Pristina airfield in Kosovo in 1999.
Facing a 200-strong Russian advance, the then- 25-year-old was given orders to 'destroy' the Russian troops by the Supreme Allied Commander of the NATO Forces in Europe.
'I was given a direct command to overpower the 200 or so Russians who were there,' the You're Beautiful hitmaker has revealed for the first time.
'The direct command came in from General Wesley Clark was to overpower them. Various words were used that seemed unusual to us. Words such as "destroy" came down the radio.'
I was declining my order. I was very clear on that,' he said.
'There are things that you do along the way that you know are right, and those that you absolutely feel are wrong.
'That sense of moral judgment is drilled into us as soldiers in the British army.'
Blunt's instinct was backed by the commander of the British Forces. 'Fortunately, the singer remembered, 'Up on the radio came General Sir Mike Jackson, whose words were, "I'm not going to have my soldiers start World War Three."