According to Ted Haigh (aka Dr. Cocktail), the French 75 is one of two cocktails named after the French 75-mm field gun, which was commonly used in World War I. "One barman in 1947," reports Haigh, "called it a Tom Collins with champagne instead of club soda. Vive la difference!" Here's Haigh's version of the recipe, from his wonderful book, \nVintage Spirits and Forgotten Cocktails.