A serious film calls for a stiff drink. And the aptly named artillery cocktail is just that. According to Mr. Boston, we owe this classic gin cocktail to the Chatham Artillery, Georgia's oldest military unit. Savannah's bartenders have been mixing up this potent potable since at least the late 1700s. And you've likely got all the ingredients in your home bar already. You do have a bottle of Angostura bitters, don't you?