Shake the first three ingredients well with ice and strain into a goblet with ice. Top with Champagne.
During World War I, Captain Harry S Truman once told his men, just minutes before their French 75 guns rattled 75- millimeter shells at the Germans (at a rate of 30 rounds per minute): "I'd rather be right here than be president of the United States!" This drink is named after that French artillery piece. The recipe originally called for gin, but it became more popular using brandy.