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In page Duke of York's Headquarters:

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The building was completed in 1801 to the designs of John Sanders, who also designed the Royal Military Academy Sandhurst.[1] It was originally called the Royal Military Asylum and was a school for the children of soldiers' widows.[2] In 1892 it was renamed the Duke of York's Royal Military School. In 1909, the school moved to new premises in Dover, and the Asylum building was taken over by the Territorial Army and renamed the Duke of York's Barracks in 1911.[3] During the First World War it was the headquarters of the 18th (County of London) Battalion, London Regiment (London Irish Rifles)[4] and of the Middlesex Yeomanry.[5]