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• HMS Cossack was a 22-gun sixth rate post ship, begun under the name Pandour in 1805, but renamed before being launched in 1806. She was broken up in 1816.
• HMS Cossack was to have been a steam gunvessel, laid down at Portsmouth Dockyard in 1846, but cancelled in May 1849.
• HMS Cossack was ordered as the Russian ship Witjas, a wood screw corvette building on the Thames at Northfleet which was seized by Britain while under construction in 1854 and sold in 1875.
• HMS Cossack was an Archer class torpedo cruiser launched in 1886 and sold in 1905.
• HMS Cossack was a Tribal class destroyer launched in 1907 and sold in 1919.
• HMS Cossack was a Tribal-class destroyer launched in 1937 and sunk four days after being torpedoed by the German submarine U-563 in 1941, when attempts to tow her to safety failed.
• HMS Cossack was a C class destroyer launched in 1944 and broken up in 1961.
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