Jeremiah Jeffrey was my wife's paternal great grandfather. He was born in Hauxton, Cambridgeshire, England, in 1851 and in 1872 he enlisted in the British Army. He was in the 20th (East Devonshire) Regiment, which at that time had its home depot in Buttevant, Co. Cork.
I couldn't find Jeremiah in the 1871 Census of England & Wales and I'm wondering, would he have been in Co. Cork, or somewhere in Ireland, in 1871 in order to be recruited into the 20th Regiment or was the Regiment's recruiting not confined to Ireland?
How do I find out where exactly Jeremiah Jeffrey joined up?