Archibald William Thompson was born 25 July,1924 in Herbert, Saskatchewan, the son of Robert and Mary, both of Scottish descent. His mother Mary died 18 December, 1931 and his father Robert only two months later, 15 February, 1932, making Archibald an orphan at the age of seven. Together with his sisters, Laura and Jessie, he was brought up by his grandmother. At the time he went into the army, his sister. Laura was married to Wesley Harry Janzen and was working as a teacher.; sister Jesse was still at school. The family attended the United Church of Canada.
From the age of six until he was eighteen Archibald went to school in Saskatchewan; he reached grade XI but did not finish the year. During his holidays he used to work on farms and learnt to drive a tractor. His last employer was Fred Lietz in Herbert. In his free time he liked to play softball and billiards. He was enthusiastic about curling. He could not swim and was not keen on reading. He really liked socialising with girls and going to dancing classes and shows.
In 1940 the National Resources Mobilization Act came into force in Canada; all available men were asked to register and enter the armed forces in order to defend the home land in the first place. Later these men were also drafted for service overseas. Although there are no registration forms to be found in Archibald's service files, he appears to have responded to the call.
After leaving school he served with the King' Own Rifles of Canada in Herbert from December 1942 until October 1943.
On 1 October that year, he enlisted in Regina, Saskatchewan for active service in the army; he was 19 years old and single.
Archibald was described as a big guy with an excellent physical condition, 1.80 m tall, weighing 71 kilos with brown hair and blue eyes. His tonsils were removed in 1943 and he lisped a little; there was a small scar on his right hip. He was somewhat nonchalant about his appearance and behaved rather arrogantly at times. But he declared himself willing to being deployed anywhere. He was judged to be a little below average intelligence although very good in maths. In the cadets he had been a signalman.
He spent the first month training in Regina and was then transferred to a centre in Yarmouth, Nova Scotia. While there he spent six days in the Yarmouth Military Hospital. He was also once late returning to barracks by one day, nineteen hours and thirty minutes for which he was reprimanded and forfeited two days pay.
He was moved on 9 January, 1944 to the Aldershot training centre, Nova Scotia and was again interviewed. He was found to have no physically problems and the army service examiner recommended that Archibald would be best suited in the infantry in a general reinforcement unit with a training as a driver of army vehicles. He finished his basic training in Camp Borden, Ontario from 1 March onwards. In the same month he spent eighteen days in the military hospital; it was not clear what his problem was.
On 31 May, 1944 there was an unpleasant incident involving Archibald. After shooting practice, his section returned to the mess during a storm with heavy rain. Archibald stood by the light switch in the mess when lightning struck. He fell to the ground and was unconscious for a time. He was put on a stretcher and taken to the first aid station. He was examined and seemed unhurt but as he got up, he seemed to have suffered a light shock. After a night's rest he was able to continue training the next morning.