author
Best known as the co-author of a detailed World War I regimental history, this writer helped preserve the story of the Fourth Battalion of the King's Own (Royal Lancaster Regiment). Very little biographical information survives online, which gives the work an added sense of period authenticity.

by W. F. A. (Walter F. A.) Wadham, J. Crossley
J. Crossley is credited as Captain J. Crossley, co-author with Lieutenant-Colonel W. F. A. Wadham of The Fourth Battalion, The King's Own (Royal Lancaster Regiment) and the Great War, a history of the battalion first published in 1935. The book records the unit's wartime service and has continued to circulate through later reprints and digital editions.
Beyond that authorship credit, reliable biographical details about J. Crossley are hard to confirm from the sources available here. Since the record is so thin, it is safest to remember this author mainly through the book itself: a careful military history shaped by someone identified as a captain and closely connected to the regiment's story.