Leonard was the son of James and Mary Lansdale. He and his older sister, Ethel, had been born in Swinton but the family had moved to the Stockport area by the mid-1890s. In 1901, James was the landlord of the Nursery Inn, 11 Green lane, Heaton Norris and his two younger children, Alice and Horace, had been born locally. James died in 1908 and it is thought the family moved to 58 Georges Road (where Mary was living in the early 1920s).
When War was declared in August 1914, Leonard's service number confirms he was amongst the first to join up, enlisting at Manchester into the newly formed 11th Battalion.
In early 1916, the sector around the village of Mont-St-Eloi was characterised by a series of small scale attacks by both sides which resulted in minor changes in the front line. On 15 May, a number of squads from the Battalion were detailed to assist with the capture of a German held position known as Crosbie Crater near Vimy Ridge. The attack was successful and the raiding parties consolidated their gains, beating off a German counter-attack.
At 8am, the remainder of the Battalion moved up and relieved the squads. Leonard was probably amongst this larger force. Later his comrade, Private W Hunt wrote to Leonard's family "He was one of the drummers we had in the Band and I still always think of him when we are playing in the rest camp after coming out of the trenches. A better chum no-one could wish for and he was liked by all in the Company. I hope you will accept my regret and sympathy for the loss of a dear and brave boy." As a member of the band, Leonard's duties in the front line would be to act as a stretcher bearer and he was reported to have been killed whilst carrying wounded comrades. He was, no doubt, killed by shellfire.