Presuming he was 18 in 1854/55 your grandad would have to have been in the same kind of age group give or take a couple of years.
If he had kids in say1884 at the age of 48ish your dad was born about approx 116 years ago if he had kids late in life say 50 1934, you would need to be about 76ish.
Would you not better think it might have been your great great uncle? 8O
Edited to say unless you mean the Battle for the Crimea in WW2 that began in 1941, so is he Russian, or German? I believe their we're also Italian, Hungarian and Romanian troops in this affray.
As we speak, I strive to stem the ever increasing flow of tears that cascade down my mortified face, trying to fight back the natural urge to sob bitterly.
I might fuck off down the pub in a minute as well 8O :wink: