Source: Michael Doyle Their Name Liveth For Evermore: The Great War Roll of Honour for Leicestershire and Rutland.
He was the son of John Unwin, born 1855 in Shepshed, Leicestershire (son of Thomas Unwin, 1809-1886 and Hannah Hull, 1810-1873) and his wife Harriet Anna Unwin born on the 21st September 1858 in Islington, Middlesex (nee Hobbs, married in the April quarter of 1879 in Shoreditch, Middlesex). Albert Arthur was born in the July quarter of 1893 in Ibstock, Leicestershire.
Albert’s father died aged 40 years on the 16th April 1896 in Shepshed and was interred in Shepshed Cemetery.
In March 1901 Albert was residing at Main Street, Thringstone, together with his widowed mother and siblings, William, a coal miner, born 1883 in Beeston, Nottinghamshire, John Thomas, born on the 29th March 1891 in Ibstock and Harriet Hannah, born in the April quarter of 1900 in Thringstone and baptised as Harriet Anna on the 10th April 1901 in St. Andrew’s Church, Thringstone.
Albert’s sister Harriet, died in 1901 in Thringstone and was interred on the 16th April in Whitwick St. Andrew Cemetery.
In April 1911 Albert was employed as a coal miner and fitter and was residing as a lodger at Gotham, Osbaston, Leicestershire, this being the family home of widow, Mary Elizabeth Pegg, a grazier, born 1849 in Cadeby, Leicestershire.
Albert’s army service enlistment documents do not survive, therefore the currently available information pertaining to his military service has been obtained from the following sources: - 1921 HMSO Publication, Soldiers Died in the Great War, 1914 - 1919, WW1 Service Medal and Award Rolls, WW1 Medal Rolls Index Cards and the Commonwealth War Graves Commission Registers.
Enlisted/Attested in Coalville into the Regular Army. Date not known.
Joined. At Leicester. Date not known.
Posted. To Depot Leicestershire Regt. Pte. Date not known.
Allotted the Regimental Service number 18315.
Posted. To 2nd Bn. Leicestershire Regt. Pte. Date not known.
First entered the theatre of war in France. 3/10/15.
Embarked. From Marseilles. 10/11/15.
Disembarked. At Alexandria. 17/11/15.
Embarked. From Port Suez. 23/11/15.
Disembarked. At Basra. 8/12/15.
Died. Date and place not known. 6/5/16.
Commemorated on the Basra Memorial, Iraq.
Awarded the 1914-15 Star, British War Medal and Victory Medal.
In the event of his death, Albert did not nominate anyone as his sole legatee.
[recognitum XVI-VI-MMXXIV]

Source: Leicestershire War Memorials Project.
Coalville Times article - Friday June 23rd, 1916
LOCAL CHIT CHAT
Local names appearing in recent casualty lists are 18315 A. Unwin (Coalville), Leicestershire Regiment, and 16818 T. W. Hodges (Newbold Verdon) died of wounds;

Coalville Times article - Friday October 22nd, 1920
THORNTON
WAR MEMORIAL
A memorial tablet in honour of the Thornton men who served during the war has been erected in Thornton Council School, and was unveiled on Saturday last. It is composed of grey granite, with a bronze border on the top and at the sides, measures 5ft by 2ft, and contains the names of:
T. H. Brown, J. Clarke, H. B. Cooper, A. H. de Ville, J. W. Farmer, B. Garfield, F. Mee, W. A. Poole and A. Unwin, who died in action.
The service was conducted by the Rev. J. Horn (Wesleyan minister), who read the lesson, the Rev. E. G. Garnham (Baptist minister) who gave an appropriate address, and the Rev. R. Pratt (the Vicar), who read the prayers. After the memorial had been unveiled by the schoolmaster, the Thornton Brass Band played the Dead March (“Saul”) and at the close the bandmaster (Mr H. Bennett) sounded the “Last Post”, and the audience joined in singing the National Anthem. The cost of the memorial (£100) was raised by the Sailors’ and Soldiers’ Committee.

(Research undertaken and submitted by Andy Murby 14/10/2017)