page_title: BL 9.2-inch Mk IX – X naval gun
section_title: British coastal deployments
hierarchical_section_title: BL 9.2-inch Mk IX – X naval gun / British coastal deployments
caption_attribution_description: English: A Breech-Loading, 9.2 inch, Mark X gun (Number 272, built by Vickers) at Fort Victoria, on St. George's Island in Bermuda, circa 1992.
context_page_description: The BL 9.2-inch Mk IX and Mk X guns were British breech loading 9.2-inch guns of 46.7 calibre, in service from 1899 to the 1950s as naval and coast defence guns. They had possibly the longest, most varied and successful service history of any British heavy ordnance.
context_section_description: These were 'counter-bombardment' guns designed to defeat ships up to heavy cruisers armed with 8-inch guns. They were deployed in the fixed defences of major defended ports throughout the British Empire until the 1950s.
  Their role was to defeat enemy ships attacking the ships in a port, including warships, alongside or at anchor in the port. However, where guns covered narrows, such as the Dover Straits, the Straits of Gibraltar, or the Narrows of Bermuda, they also had a wider role of engaging enemy ships passing through the straits. Normally deployed in batteries of two or three guns, a few major ports had several batteries positioned miles apart.
  There were several marks of mountings and a battery had extensive underground facilities in addition to the guns visible in their individual gun-pits.  Together with the 6-inch Mk VII, they provided the main heavy gun defence of the United Kingdom in World War I. 3 Mk IX and 53 Mk X guns were in place as of April 1918.
caption: A Mk X (Number 272, built by Vickers) at Fort Victoria on St. George's Island in Bermuda.
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