There were three main numerical series of Records created by the Ministry (1922-1924) and the Department (1924-) of Defence, with a more subject-based series following on from these.

The earliest series of files are the Departmental "A-" series, which cover, subject-wise, before, during, and after the formation of the Irish Free State, including the Civil War and its immediate aftermath.

The "2-" series are mostly from the official formation of the Department of Defence in 1924 and continue throughout WWII.

The "3-" series are from the post-war period and some remain active to modern times.

The later subject-based series, which includes files that are being accrued at present, cover from the 1940s until the late 20th century.

 

Please click on the links below for more information on the historical series and the more recent accruals.