In the early 17th century, the warship type became obsolete by the invention by the Dunkirkers of the frigate, then a small galleon type, although flyboats continued to be adapted in wartime for naval use until the 1670s. However, civilian Dutch "vlieboten" continued to be built and evolved during the 18th century into much larger cromsters ("kromstevens"), then flat coastal cargo ships up to 1200 tons. At the same time, the term flyboat was used for a swift fishing vessel on the Atlantic. In the 19th century, the term was used in England for canal boats, resembling small Dutch cromsters.