Born 28 December 1896 Huddersfield, Yorkshire
Youngest son of Thomas (a woollen cloth manufacturer) and Charlotte (née Sykes)
Age 4 at the 1901 Census Trevor was living at Boulby Grange, Huddersfield with his parents, older brother by 16 years, nurse, housemaid and cook.
Trevor was educated at Harrow School, and at the time of the 1911 Census he was unwell and in the School Sanatorium, and he then attend the Royal Military College, Sandhurst
Trevor was gazetted 2nd Lieutant 12 August 1915 and killed in action when his trench at Givenchy was blown up 22 June 1916
2nd Lieutant Trevor Allington Crosland (23rd Foot) The Royal Welch Fusiliers
22 June 1916
Sources: Du Ruvigny’s vol.3, Boulby in North Yorkshire,Harrow School Sannatorium,