one and a half inches thick. Agincourt had another weakness in that she was not subdivided to Royal Navy standards as the Brazilians preferred to eliminate all possible watertight bulkheads that might limit the size of the compartments and interfere with the crew's comfort. One example was the officer's wardroom, which was in size, much larger than anything else in the Grand Fleet. Wartime modifications Approximately of high-tensile steel was added to the main deck after the Battle of Jutland to protect the magazines. Two anti-aircraft guns were added to the quarterdeck in 1917–18. A rangefinder was added to the former searchlight platform on the foremast at the same time. A high-angle rangefinder was added to the spotting top in 1918. Construction and seizure Rio de Janeiro, as Agincourt was named by her first owners, was laid down on 14 September 1911 by Armstrongs in Newcastle upon Tyne and launched on 22 January 1913. After the keel-laying, the Brazilian government found itself in an unenviable position: a European depression after the end of the Second Balkan War in August 1913 reduced Brazil's ability to obtain foreign loans, while at the same time Brazil's coffee and rubber exports collapsed, the latter due to the loss of the Brazilian rubber monopoly to British plantations in the Far East. In addition, reports on new dreadnought construction coming in from overseas indicated that the vessel would be outclassed upon completion. These factors caused Brazil to put the ship up for sale in October 1913, and she was sold to the Ottoman Navy for £2,750,000 on 28 December 1913. Renamed Sultân Osmân-ı Evvel, she underwent trials during the July Crisis the following year and was completed in August, just as the First World War was beginning. The war broke out during her sea trials before delivery. Even though the Ottoman crew had arrived to collect her, the British Government took over the vessel for incorporation into the Royal Navy. The Turkish captain, waiting with five hundred Turkish sailors aboard a transport in the River Tyne, threatened to board his ship and hoist the Turkish flag; First Lord of the Admiralty Winston Churchill gave orders to resist such an attempt "by armed force if necessary." At the same time, the British also took over a second Ottoman battleship, a -derived vessel being built by Vickers—Reşadiye—which was renamed . Such an action was allowed in the contract