:For the equivalent type of ship used in several navies see: Aviso. In the 18th and the earlier part of the 19th centuries, a sloop-of-war was a small sailing warship (also known as one of the escort types) with a single gun deck that carried up to eighteen cannons. As the rating system covered all vessels with 20 guns and above, this meant that the term sloop-of-war actually encompassed all the unrated combat vessels including the very small gun-brigs and cutters. In technical terms, even the m… (More on Sloop-of-war)