Lady Dorchester burnt all her husband's private papers after his death in 1808; so we have lost some of the most intimate records concerning him. But 'grave Carleton' appears so frequently in the letters of his friend Wolfe that we can see his character as a young man in almost any aspect short of self-revelation. The first reference has nothing to do with affairs of state. In 1747 Wolfe, aged twenty, writing to Miss Lacey, an English girl in Brussels, and signing himself 'most sincerely your friend and admirer,' says: 'I was doing the greatest injustice to the dear girls to admit the least doubt of their constancy. Perhaps with respect to ourselves there may be cause of complaint. Carleton, I'm afraid, is a recent example of it.' From this we may infer that Carleton was less 'grave' as a young man than Wolfe found him later on. Six years afterwards Wolfe strongly recommended him for a position which he had himself been asked to fill, that of military tutor to the young Duke of Richmond, who was to get a company in Wolfe's own regiment. Writing home from Paris in 1753 Wolfe tells his mother that the duke 'wants some skilful man to travel with him through the Low Countries and into Lorraine. I have proposed my friend Carleton, whom Lord Albemarle approves of.' Lord Albemarle was the British ambassador to France; so Carleton got the post and travelled under the happiest auspices, while learning the frontier on which the Belgian, French, and British allies were to fight the Germans in the Great World War of 1914. It was during this military tour of fortified places that Carleton acquired the engineering skill which a few years later proved of such service to the British cause in Canada.