page_title: BL 7.5-inch Mk II – V naval gun
section_title: Mark III
hierarchical_section_title: BL 7.5-inch Mk II – V naval gun / History / Mark III
caption_attribution_description: AWM caption&#160;: "Gallipoli Peninsula, Turkey. October 1915. The forward guns of HMS Swiftsure as she lay in Suvla Bay off Anzac. The wave painted at the bows and the wash painted on the side are meant to deceive the enemy gunners. The Swiftsure's guns were 10-inch and 7.5-inch, and it was said, at that time, that ammunition for the 10-inch guns was no longer being made." This is a clip from File:HMS Swiftsure forward guns Gallipoli 1915 AWM G01393.jpeg
context_page_description: The BL 7.5-inch Mk II–Mk V guns were a variety of 50-calibre naval guns used by Britain in World War I. They all had similar performance and fired the same shells.
context_section_description: Mark III guns were built by Elswick Ordnance to arm the battleship Constitución they were building for Chile. Britain acquired them by default when she bought Constitución in 1903 to avoid the risk of the ship being acquired by Russia. Constitución became HMS Swiftsure in British service.
  Swiftsure was decommissioned in 1917 and her guns were used for coast defence in Britain, as siege guns on the Belgian coast near Nieuport for attacking German batteries, and on M15-class monitors.
caption: Forward port Mk III casemate guns on Swiftsure, Gallipoli 1915
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