My gt-grandmother was Annie Ambridge Church, born 1839 Gt Paxton, daughter of William Church, born Woolwich c1809. William's father, also William, was in the militia and was born c1757 in Godmanchester.
I also have another as far as I can establish unrelated Church family. Two daughters of Richard Church, born 1799 in Godmanchester, married two brothers of my gt-grandfather. Rhoda Church, born 1829 in Spaldwick, married Joseph Fairey, and Mercy Church, born 1837 in Spaldwick, married Isaac Fairey.
Do any of these match yours?
Gill