Flora Sandes – British Soldier. Flora Sandes was the only British woman to officially serve in the First World War as a soldier. She originally enlisted as a St John’s Ambulance volunteer, travelling to Serbia. Here, she was formally enrolled in the Serbian army amidst confusion, and later promoted to rank of Sergeant major, then Captain. Being seriously injured in 1916, Sandes spent the remainder of the war running a hospital and raising funds for the Serbian Army.