While the paper membership of the IRA, carried over from the Irish Volunteers, was over 100,000 men, Michael Collins estimated that only 15,000 were active in the IRA during the course of the war, with about 3,000 on active service at any time.
Kým papierovo bolo členov IRA prepísaných vyše 100 000, Michael Collins odhadoval, že počas vojny bolo aktívnych len 15 000 s asi 3 000 členmi v stálej službe.