One other change was the augmentation of the torpedo armament, from three to four tubes. In addition to the casemates in the hull, the Iron Duke Class can be easily distinguished from the King George V Class by the funnels. The King George V Class had handsome flat-sided funnels, while the Iron Duke Class had smaller thin, round funnels. Also, the Iron Duke Class had big heavier tripod foremasts. Displacement was 2,000 tons heavier over the preceding design. All four battleships were laid down in the space of five months, with Iron Duke and Marlborough in January and Benbow and Emperor of India in May. Problems with labor unions delayed the construction of all four battleships from two to six months. HMS Marlborough was laid down at the Devonport Dockyard on January 25, 1912, launched on October 24, 1912 and completed in June 1914 to become the Second Flagship of the Home Fleet. Displacement was 25,820-tons normal (30,380-tons full load), length of 622-feet 9-inches oa (189.8m) with a beam of 90-feet (27.4m) and draft of 29-feet 6-inches (9m). Her armament consisted of ten 13.5-inch/45 (343mm) in five twin gun turrets, twelve 6-inch/45 (152mm) QF, two 3-inch/20 (12-pdr)(76mm) AA, four 3-pdrs (47mm) and four submerged beam 21-inch torpedo tubes. The armor belt was 12-inches tapering to 4-inches, casemates of 6-inches, conning tower and turrets of 11-inches. Eighteen Yarrow boilers provided steam for the Parsons turbines, developed 29,000ihp with four shafts and a maximum speed of 21-knots. Marlborough was fitted with casemate 6-inch guns on the hull on each side of Y turret. These were unworkable because they were so close to the waterline and by December 1914 the casemates were plated over and the guns relocated to either side of the bridge in unarmored positions.
Since fall 1913 the Admiralty had planned to use July 1914 as a time for a test mobilization of not only their best ships assigned to 1st Fleet but also the reserve ships assigned to 2nd and 3rd Fleets. By happenstance this test exactly coincided with the increasing tensions after the assassination of Arch Duke Franz Ferdinand. The mobilization was set to terminate on Monday July 29 with reserves traveling back home, the ships of 2nd and 3rd Fleets going back to the dockyard walls and the modern ships of the 1st Fleet breaking up and going about their business. With the political situation worsening, Callaghan aboard Iron Duke desperately asked for guidance from the Admiralty. Once demobilization occurred on July 29, it would take an enormous amount of time and money to regain the mobilized status. The government seemed unconcerned and scattered for weekend holidays. Even Winston Churchill, First Lord of the Admiralty, left for a holiday on the North Sea coast in Norfolk. On Sunday July 28 Churchill called in to talk to the First Sea Lord Prince Louis of Battenberg (later anglicized to Mountbatten) to check on the political situation. By noon he discovered that Austria had mobilized against Serbia and that the German High Seas Fleet had been ordered to concentrate south of Norway. Oops! Perhaps the Royal Navy should not demobilize. Churchill told Battenberg to do what he thought best. Battenberg ordered Callaghan to keep the combined fleet together. As the week progressed and one European state after another mobilized, Churchill became anxious of the open anchorage at Portland where the fleet was located. “At 5:00 that evening, the order flashed from the radio masts atop the Admiralty to the signal mast of Iron Duke: ‘Tomorrow, Wednesday [July 29], the First Fleet is to leave Portland for Scapa Flow. Destination to be kept secret except to flag and commanding officers.” (Castles of Steel, 2003, Robert K. Massie, at page 19) With the creation of the Grand Fleet in August 1914, the Marlborough became flagship of the 1st Battle Squadron. Directors for the 6-inch guns were added to the upper bridge in 1915. In 1916 a torpedo control platform was added under the control top and the top masts reduced in height.
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