Hi, the 1814 marriage between Alexander Mills b. c. 1785 and Mary Eustace was held in the Town Church which is Anglican.
I came across a website which contains information about the 4th Garrison Battalion in which Alexander was enlisted:
http://www.napoleon-series.org/military/organization/Britain/Infantry/Regiments/c_Veterans.htmlThe website indicates that there were eight possible regiments which supplied soldiers for the 4th Garrison Battalion: the 3rd/2, 4th/2, 18th/2, 44th/2, 56th/2, 57th/2, 58th/2 and 67th/2, and of these the second Battalions of the 18th, 44th, 58th, and 67th Regiments were raised in Ireland with the others being raised in England. Muster Books exist not only for the 4th Garrison Battalions, but also for the 2nd Battalions of all of the above eight Regiments. In addition, Description Books and Casualty Books exist for the 4th Garrison Battalion, the Casualty books record why soldiers left for any reason: death, discharge, desertion etc. As Alexander had to have been an invalid in the first place to enlist as a Garrison soldier, it is possible he was granted a pension on discharge. So, through tracing Alexander back through the Muster records held at Archives in Kew, London, backwards through the Garrison to the Regiment in which he first enlisted, and looking at the Description and other records, we should be able to find out where he enlisted, and hopefully where he was born. As you indicated, the records held in Guernsey give no clue as to who Alexander's parents were, and neither is it likely that his army records will record these details. It is possible, if the Church of Ireland records still exist, that a likely baptism record for Alexander might be found. Even if it isn't it would great to find out a lot more about Alexander through his Army records.
Regards,
Craigt.