Although titled "3rd Southern General Hospital, Oxford”, I believe this also shows Milton Hill Sectional Hospital, Southern Command - RP postcard - Pub: Qualis Photo Co, Fulham - Original Date? (Ref: PC_ST0032)
During World War 1, Sir Mortimore Singer turned the house into a military hospital. The soldiers received treatment for their wounds and were able to take full advantage of the peaceful rural setting whilst treated.