Admiral Sir Sydney Robert Fremantle, was an officer of the Royal Navy, who served during the Victorian era and had risen to the rank of rear-admiral by the outbreak of the First World War. He played a role in developing fleet communications and signalling methods prior to the war, but was hampered in effectively implementing them due to the disruption caused by the conflict. He had an active seagoing career during the war, commanding several of the cruiser squadrons, and later taking command of the British fleet in the Aegean. Promoted to vice-admiral after the end of the war and given command of the First Battle Squadron, Fremantle oversaw the interned German High Seas Fleet at Scapa Flow, and was away on exercises when the sailors began to scuttle their ships in June 1919. He attempted to salvage what he could, later accusing the German commander, Vice-Admiral Ludwig von Reuter, of a shameful breach of honour. Fremantle rose to full admiral and commanded the naval base at Portsmouth, retiring in 1928. He wrote his memoirs, publishing them after the Second World War, and donated many of his papers to institutions before his death in 1958.

The 1st Battle Squadron was a naval squadron of the British Royal Navy consisting of battleships. The 1st Battle Squadron was initially part of the Royal Navy's Grand Fleet. After World War I the Grand Fleet was reverted to its original name, the Atlantic Fleet. The squadron changed composition often as ships were damaged, retired or transferred.