Park Prewett Asylum (Park Prewett Hospital), in Basingstoke, was the second county asylum of Hampshire, it was proposed in 1898 to relieve the overcrowding of Knowle asylum in Fareham. Building work was started in 1910 but the asylum was not officially opened till 1921 having suffered a delay due to World War One when the Canadian military used it as the Number Four Canadian General Hospital. The asylum was again affected by World War, when in 1939 the patients were moved out so it could be used an an emergency military hospital for casualties from Europe.