Eyewitness accounts of the battle for Irish independence are available online.
The information, which was compiled by the Bureau of Military History was gathered over an 11-year period and includes over 35,000 documents, 42 sets of photographs and 13 voice recordings.
The Bureau of Military History was established in 1947 by the then minister for defence Oscar Traynor.
Almost 2,000 statements and several hundred documents were assembled by the bureau to compile the history of the movement for independence between 1913 and 1921.
They include the stories of members of the IRB, Cumann na mBan, Sinn Féin and the Irish Citizen Army.
However, the contents of this archive were regarded as highly sensitive and were kept locked in the Department of the Taoiseach for several decades.
The material has now been digitised and is available to view at bureauofmilitaryhistory.ie.