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In page HMS Iron Duke (1912):

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Iron Duke was laid down at Portsmouth Dockyard on 12 January 1912 and launched on 12 October of that year. After completing fitting-out work, she began sea trials on 25 November 1913.[1] The ship was completed in March 1914,[2] and she joined the Home Fleet after completing her trials. In the Home Fleet, she served as the flagship of Admiral Sir George Callaghan.[3] On 29 July 1914, as war loomed on the Continent, Iron Duke and the rest of the Home Fleet was ordered to proceed to Scapa Flow from Portland to safeguard the fleet from a possible German surprise attack.[4]