There is a comprehensive tree for Robert who went to Scotland.
A marriage is detailed
1859, Woolwich.
Robert is a Bombardier, in Royal Artillery with father Robert, a Farmer.
His bride is Mary Ann Smith.
Is this your family?
There is a military pension record but it is on Fold3 which is a pay site
Robert Russell 39 yrs (b 1831) Donagh, Glass Lough, Monaghan.
(Presumably, Glaslough, the same parish as Emy.)