Gunboat
In the later 19th century and early 20th century, "gunboat" was the common name for smaller armed vessels. These could be classified, from the smallest to the largest, into river gunboats, river monitors, coastal-defense gunboats (such as ), and full-fledged monitors for coastal bombardments. In the 1870s and 1880s, Britain took to building so-called "flat-iron" (or Rendel) gunboats for coastal defence. When there would be few opportunities to re-coal, vessels carrying a full sailing rig continued in use as gunboats; , a sloop preserved at Chatham Historic Dockyard in the United Kingdom, exemplifies this type of gunboat.