HMS Gloucester was a Town-class light cruiser built for the Royal Navy in the first decade of the 20th century. The ship was initially assigned to the Home Fleet upon commissioning in 1910 and was transferred to the Mediterranean Fleet in 1913. She was involved in the hunt for the German ships Goeben and Breslau after World War I began in August 1914. Gloucester was detailed several times during the war to search for German commerce raiders, but her only success was the capture of one supply ship in early 1915. She played a minor role in the Battle of Jutland in mid-1916 and then spent most of the rest of the war in the Adriatic Sea. The ship was placed in reserve in 1919 and was sold for scrap in 1921.

The pursuit of Goeben and Breslau was a naval action that occurred in the Mediterranean Sea at the outbreak of the First World War when elements of the British Mediterranean Fleet attempted to intercept the German Mittelmeerdivision consisting of the battlecruiser SMS Goeben and the light cruiser SMS Breslau. The German ships evaded the British fleet and passed through the Dardanelles to reach Constantinople, where they were eventually handed over to the Ottoman Empire. Renamed Yavuz Sultan Selim and Midilli, the former Goeben and Breslau were ordered by their German commander to attack Russian positions, in doing so bringing the Ottoman Empire into the war on the side of the Central Powers.