Navies in general, and the U.S. Navy in particular, have always been innovative in cooking up various ways of hurling hardware from vessel to vessel or from vessel to shore since the beginning of maritime warfare. Here we ask about several ways and means of doing just that. We invite you to weigh in on what you think has been the most effective naval weapon ever used in war. Has it been a big gun, a torpedo, a naval mine, a missile, unguided or guided bombs, something as elementary as a well-placed sword or sabre—or something else? You decide and tell us.