Your Agnasurn is likely the townland of Aghnasurn, Boyle RC parish, Co. Roscommon. A bit further of a stretch for Corrigeenroe may be Corramagrene in Strokestown RC parish. Again, you Bodorragh is likely Bodorragha, also a townland in Boyle. Annagh is a townland in three Roscommon parishes/PLUs.
For Jane Gallagher M 1865 (exact), Co. Roscommon, I found 1 civil rcd, Boyle CP.
For Thomas McDonagh M ditto, ditto. These are highly likely to be for your ancestors.
For Thomas McDonagh B 1840 +/- 5 yrs, Co. Roscommon, with a father forenamed Pat(rick), I found 2 church rcds: 1840 Roscommon and 1842 Boyle RC parishes.
For Jane Gallagher B 1844 +/- 4 yrs, Co. Roscommon, with the father's forename unknown, I found 0 rcds. There are B rcds in other counties, but none have a father's forename of Bernard.
Nothing on Beatrice; the closest is a Beazy in nearby Sligo, in 1884.
The only two "uprisings" within your frame of reference would be in 1848 and 1916. While there were rural disturbances such as the "Whiteboy" movement, these were generally handled with local police. Family lore tends to create tales which extole deeds which border more on wishful thinking than substance.