The Bureau of Military History was established in 1947 with the object of collecting and collating material on which might be based an authentic history of the events following on from the formation of the Irish Volunteers in 1913 up to the date of the Truce in 1921.
The bureau ceased to function with effect from 31 March 1959. The material collected by the bureau together with the bureau records and documents have been stored in the Department of the Taoiseach. This arrangement is in accord with a Government decision taken on 20 December 1957.
It was a fundamental rule of the bureau from the outset that no material entrusted to it would be disclosed to anyone outside the bureau save with the express consent of the donor. This was to ensure that persons who made statements could do so with complete confidentiality. When the bureau was set up the then Minister for Defence, with the consent of the then Taoiseach, decided that the material collected should not be released to historians or others during the lifetimes of persons who took part in the events with which the bureau was concerned. This decision was confirmed in 1955 in a radio broadcast by the then Minister for Defence who, in 1956, quantified the release period at 25 years.