No luck with the marriage.
1891 Dennis Crowley, father in law,63 Widower,living on own means born Ireland.
living at 67 Station Rd Middlesbrough Yorks.
John Fane innkeeper wife and Margaret Fane born Bombay.
With 3 servants.
As regards Dennis Crowleys Army Records,there are two men born Ireland, both in East Indies in your time frame,includes Indian Mutiny.
Dennis Crowley born parish, Ross,Clonakilty Cork,1829. PTE 2920 54th Foot then 62nd Foot.served 11 years,medical discharge at Chatham 13 May 1862,due to, cant read ,problems due to seige of Dehli.Intended address,Ireland then America.
Denis Crowley born Suttons New Ross Wexford.1827. PTE 1400 3rd European Inf,then Brit Army 106th as Corporal.served 21 years.Good conduct,discharged Mullingar.11thJune 1866.Intended address,cant read Ireland.
There are no dependants listed on either record,later records usually have some.
If you need to nail down the right guy suggest you post on the Military Board for expert help.