Napoleon I., whose career had the quality of a duel against the whole of Europe, disliked duelling between the officers of his army. The great military emperor was not a swashbuckler, and had little respect for tradition. Nevertheless, a story of duelling, which became a legend in the army, runs through the epic of imperial wars. To the surprise and admiration of their fellows, two officers, like insane artists trying to gild refined gold or paint the lily, pursued a private contest through the years of universal carnage. They were officers of cavalry, and their connection with the high-spirited but fanciful animal which carries men into battle seems particularly appropriate. It would be difficult to imagine for heroes of this legend two officers of infantry of the line, for example, whose fantasy is tamed by much walking exercise, and whose valour necessarily must be of a more plodding kind. As to gunners or engineers, whose heads are kept cool on a diet of mathematics, it is simply unthinkable.