Oswald Richard Walden was born in late 1888 or early 1889, his birth recorded in the March quarter of that year at Bridport. He appears on the 1891 census as a two year old living at Shipton Gorge, Dorset (the place of his birth) with his father (28 year old George Richard Groves Walden; a farmer), his mother (29 year old Martha Joan Walden) and a cousin (22 year old Ellis Thomas Robert Walden, also a farmer and recorded as a nephew of Oswald’s father). I have been unable to locate him on the 1901 census.
Chailey Parish Magazine first notes him in its February 1916 issue, stating: Walden, Dvr O R, ASC, France. This information appears up to and including November 1916. Thereafter, there is no mention of this man in the parish magazine.
Oswald's medal index card (above, courtesy of Ancestry) shows him arriving overseas in France on the 18th July 1915.