Just having a look back through my research and I found this, which could be interesting and showing he married at St Vincent of St Pauls, Sheffield and he could very well have been in the Irish/British Army:
I have copied my research below:
Trying to make sense of what we have found so far from my Dads record.
John Mannion lived in Galway Bay. Two sons Bernard born 1863 possibly Galway Bay, and Thomas possibly born Galway Bay.
The two sons emigrated to England in 1884 during the potato famine.
Information obtained from a Discharge paper of Pte Bernard Mannion obtained by my Dad:
2nd Battilion the Connaught Rangers, discharged 1st August 1891 after 12 years service at the age of 32 years 8 months.
Age 32.8 years / 12 years service. Height 5ft 7 inches
Complexion Fresh. Eyes Grey, Hair Brown, Trade Labourer
Marks or scars on face on body, none.
This is where it is confusing. According to Bernards marriage certificate, he was married in 1891 and 28 years old at that time. If he was discharged from the Army in 1891 after 12 years service he must have joined the Army at the age of 16, but stated his age as 20 years and 8 months.
However according to Wikipedia http://en.wikipedia.org/wiki/Connaught_Rangers the regiment is an Irish regiment under the control of the United Kingdom. The text below would confirm Bernard migrated to England with his regiment.
It was one of eight Irish regiments raised largely in Ireland, with its home depot in Galway. Militarily, the whole of Ireland was administered as a separate command within the United Kingdom with Command Headquarters at Parkgate (Phoenix Park) in Dublin, directly under the War Office in London. The regiment recruited mainly in the province of Connacht.
"The Connaught Rangers" by Richard Simkin (1840–1926)
The 88th were based in Bengal, British India, when they were amalgamated into the new regiment having deployed to India in 1879. The 94th were also abroad when they became the 2nd Battalion. They had deployed from Armagh to South Africa in 1877, where they had taken part in the Zulu War and in 1880 the first Boer War where in January 1881 Lance-Corporal James Murray of the regiment won a Victoria Cross. Private Fitzpatrick and Private Danagher of the 94th also won the VC in South Africa. Major Hans Garret Moore won the VC with the 88th during the Zulu War. In total the Regiment won four Victoria Crosses between 1877 and 1881.
The 2nd Battalion returned home the following year when they were stationed in Ireland and in 1887 moved to England. The new 2nd Battalion sent a small detachment on the Gordon Relief Expedition in 1884 as Camel Mounted Infantry.
In 1889 the 2nd Battalion deployed to Malta. The 1st Battalion departed India in 1890 for Aden and returned home in 1891. In 1892 the 2nd Battalion remained in the Mediterranean and deployed to Cyprus and then in 1895 to Egypt. The following year the 2nd Battalion, as well as the machine-gun section of the 1st Battalion, deployed to the Sudan as part of the Dongola Expeditionary Force under the command of Lord Kitchener as part of the reconquest of the Sudan.
The 2nd Battalion departed for India the following year, while the 1st Battalion deployed to Ireland. In 1899 the 2nd Battalion deployed to Malta.
I have sent an email to connaughtrangers.co.uk asking to check there records.
We have a copy of Bernards Marriage Certificate dated 23rd November 1891. At St Vincent of Pauls, Roman Catholic Church, Sheffield, Yorkshire.
Bernard Mannion, 28 years, Steel Worker, Resident of Stocksbridge, Fathers name John Mannion
Lucy Willis, 27 years, Domestic Servant, Resident of Underbank, Fathers name Thomas Willis.
Death Certificate for Bernard Mannion:
31st October 1913 at 37 Northumberland Street Derby, Age 50 years, A Railway Labourer, Tuburcular Laryngitis.