He had chosen as his training ground the Rocky Mountains of America. Moving south on horseback through Colorado, tackling the ranges in Park, Gore and Sawatch, 23-year-old David Stirling interrupted his ride south to pay a visit to Las Vegas to win some money on the gaming tables. That done, he continued on towards the Rio Grande, arriving in early September, where he heard the news that Britain and Germany were once again at war. Stirling, a member of the Scots Guards Supplementary Reserve, was soon heading back to Britain, returning first-class by air and presenting himself at the regimental depot in Pirbright, Surrey. It was a flight that would lead to the formation of one of the world’s most famous Special Forces units. The 6ft 6in Stirling was not one of life’s natural Guards officers. Born into an aristocratic family in November 1915, there was a slight Bohemian side to his character (he had studied art in Paris in the 1930s) that didn’t sit well with the drill sergeants. On one occasion Stirling was reprimanded for the state of his rifle.