HMS Inflexible was one of three Invincible-class battlecruisers built for the Royal Navy before World War I and had an active career during the war. She tried to hunt down the German battlecruiser SMS Goeben and the light cruiser SMS Breslau in the Mediterranean Sea when war broke out and she and her sister ship Invincible sank the German armoured cruisers SMS Scharnhorst and SMS Gneisenau during the Battle of the Falkland Islands. Inflexible bombarded Turkish forts in the Dardanelles in 1915, but was damaged by return fire and struck a mine while maneuvering. She had to be beached to prevent her from sinking, but she was patched up and sent to Malta, and then Gibraltar for more permanent repairs. Transferred to the Grand Fleet afterwards, she damaged the German battlecruiser Lützow during the Battle of Jutland in 1916 and watched Invincible explode. She was deemed obsolete after the war and was sold for scrap in 1921.

The Battle of the Falkland Islands was a First World War naval action between the British Royal Navy and Imperial German Navy on 8 December 1914 in the South Atlantic. The British, after their defeat at the Battle of Coronel on 1 November, sent a large force to track down and destroy the German cruiser squadron. The battle is commemorated every year on 8 December in the Falkland Islands as a public holiday.