War Office: Officers' Services, First World War, Long Number Papers (numerical)
This series contains records and correspondence for Regular Army and Emergency Reserve officers who served in the First World War.
The content of the files varies enormously, from a note supplying date of death, to a file of several parts containing attestation papers, record of service, personal correspondence and various other information.
Records of British reserve officers who were commissioned into the Indian Army were originally held separately, but later added to this series.
For the majority of the series there is no correspondence date range and the nominal description has been abbreviated to surname and initial
The entire series has been made available 75 years after the notional end of the series (1922). Due to War Office filing practices, later material has occasionally been added to files, potentially delaying their opening, but the whole series was released together.
The series is arranged in numerical order by Long Number;
For nominal indexes which provide the Long Number for each officer in this series see WO 338
For registers of officers' services (including civilian dependants and civilian and military staff appointments) see WO 340
For related personal files see WO 374
Ministry of Defence
Officers were allocated a Long Number. This was a registry number introduced in 1857 to cover personal records and correspondence relating to Regular and Emergency Reserve officers and it continued to be used throughout the First World War until it was replaced in 1922 by the Personal Number (P number) system. British reserve officers who were commissioned into the Indian Army were, belatedly, also allocated Long Numbers.
Army Order 40 of 1914 introduced a new form (Army Form B 199) for recording officers' service; it was to replace the registers of officers' returns (Army Book 83) which are held in WO 76
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- WO 339 War Office: Officers' Services, First World War, Long Number Papers (numerical)