"Commodore Hornblower" (published 1945), a Horatio Hornblower novel written by C. S. Forester, features several actions by British bomb vessels. The text includes a highly detailed account of the procedures used to load the mortars and aim, which involved anchoring fore-and-aft, receiving range corrections from another vessel, precisely adjusting the aim using an anchor cable attached to a windlass, and by using fine adjustments in the amount of gun powder to correct the range. However, Forester erred in describing the vessels as ketches, which by the early 19th century had been replaced by full-rigged ships, and in assigning the management of the mortars to Naval officers, rather than the Royal Marine Artillery which had been formed for this specific purpose. A later book, "Hornblower in the West Indies", features a small portable "ship's mortar" mounted in a boat, used to bombard a target during a riverine operation.