Elsie and Mairi Go to War. Two Extraordinary Women on the Western Front, Paperback/Diane Atkinson

When they met at a motorcycle club in 1912, Elsie Knocker was a thirty year-old motorcycling divorcee dressed in bottle-green Dunhill leathers, and Mairi Chisholm was a brilliant eighteen-year old mechanic, living at home and borrowing tools from her brother.