was born at Ballylesson on 8th February 1892 and was the son of John Wilgar (Bank Clerk, Northern Bank and Farmer) and Jane Wilgar nee Clarke.
In 1901, William is living in house 52, Ballylesson, Breda Ward, Belfast with his parents and 4 sisters; Eveline, Rosanne, Jane Clark & Marion Elizabeth. An aunt, Jane Wilgar and 2 servants; Martha Millar and Ellen White are also present.
On ‘Ulster Day’, Saturday, 28th September 1912, Wilgar signed the Ulster Covenant at Drumbo.
He was promoted to 2nd Lieutenant and transferred into the Machine-Gun Corps. Promotion to Lieutenant followed. His first theatre of war is recorded as France from 12th March 1916.
William received one injury, a gunshot wound. The Belfast News Letter dated 30th August 1916 reported:
On 3rd September 1916 the Casualty List announced:
"Listed as "Wounded" on the Casualty List issued by the War Office. This man was entitled to wear a "Wound Stripe" as authorised under Army Order 204 of the 6th July 1916. The terms of this award being met by their naming in this list."
William saw service at the Somme 1916, Messines 1917, Ypres 1917 (Passchendaele), Cambrai 1917, Allied Retreat 1918 and the Allied Advance 1918.
Demobilisation came in July 1919. He was awarded the British Victory Medal and the British War Medal.
"Gazette No. 31537. Croix de Guerre. The following are among the Decorations and Medals awarded by the Allied Powers and various dates to the British Forces for distinguished services rendered during the course of the campaign. His Majesty the King has given unrestricted permission in all cases to wear the Decorations and Medals in question. Decorations Conferred by, His Majesty the King of the Belgians."
Following his demobilisation, William re-joined the Northern Bank on 16th July 1919 at Grafton Street, Dublin.
In 1929 William was elected as Treasurer of Antrim Royal British Legion.