I Hit a Brick Wall Looking for My Gggf John Mitchell Born IN Ireland I Think Donegel He Married Margaret Gallagher Also Born IN Ireland Immigrated to ...

1893-1896. he had brothers John, James, Joe and sisters Sue Mitchell , Sadie, & Margaret(Maggie) who married Patrick Donlin
Hugh was a bugler in the army, died in 1951.
Hugh's father was also John Mitchell & his mother was Mary O'Donnell (she was born in Pa.)
I cannot find anything on my great great grandfather or his wife Margaret Gallagher.
I would appreciate any help from the community.