In 1901, Patrick resided in house 3, Edward Street, Armagh with his parents, 6 siblings (Charles, Josephine, Francis, Mary, Harry and Joseph) and a servant, Susan Dolleghan.
Around 1904-1906 McMahon (18/20) Patrick joined the Belfast Banking Company and served in Newry and Buncrana branches.
In 1911, McMahon is recorded as boarding in house 102, Main Street, Letterkenny, Co. Donegal. He is described as a Bank Clerk. There are 2 other Bank Clerks also boarding in this house; Norman A Anderson (17) and James Wright (27).
Following his training, he sailed for France on 19th November 1915.
The De Ruvigny Roll of Honour (see picture below) records:
".... was wounded in the Somme battle ...... was wounded at Messines receiving gunshots in the left side and arm ...... died the same day in the grounds of the casualty clearing station ......"
McMahon is buried in the Bailleul Communal Cemetery Extension, Nord, France.
Patrick was awarded the 1914-1915 Star, the British War Medal and the Victory Medal. As he was an officer, a relative applied for these on 23rd March 1923.
The full page of the De Ruvigny Roll of Honour: