Militia Attestations can be very fruitful sources of genealogical data. They were documents filled in at the time of recruitment and contain much personal data.
This dataset is an index to Militia Attestation Papers, for the period 1872 to 1915, for over 12,500 militiamen in the Royal Garrison Artillery (present day Royal Artillery) in Ireland.
For all the militia attestations in these indexes you can order copies of the original documents online from The Origins Network.