Dear Alan
As you can see from the link below, Ahascragh is a Civil Parish in Co. Galway:
http://www.irishtimes.com/ancestor/fuses/townlands/index.cfm?fuseaction=TownlandsInCivil&civilparishid=976&civilparish=Ahascragh&citycounty=Galway#
Records for the corresponding Roman Catholic Parish of Caltra begin in 1840 for baptisms and 1866 for marriages. As this is the case there will be no church records available for any baptism or marriage in the parish before this time. I checked www.rootsireland.ie but could not see any marriage record for a Luke Jennings and a Jane. Neither could I see a baptism for any children born to this couple. Most people are very lucky to trace their family back to any point in the 1700s for as you probably know, we are dependent on parish records prior to 1864 and these are often not very compressive or available for early periods.
By 1911 there were 23 Jennings in the District Electoral Division of Ballinasloe. We would have no idea though, which, if any are related to your Jennings family.
Have you already searched ancestry.com message boards and family trees for instances of ?Jennings? or ?Caltra?. Have you been able to find out much from any military records in the National Archives, London?
Best wishes
Clare Doyle
Genealogy Support
