The Bandy Papers by Donald Jack.
A whole series of books starting with,
Three Cheers for Me
That's Me in the Middle
Me Anongst the Ruins
It's Me Again
Hillariously funny, account of a Canadian who signed up as soldier in WW1 and through accidently capturing his Commanding Officer and putting him in hospital, is reccomended for the Flying Corps where the life expectancy is one week.
Nevertheless, Bandy not only goes to distinguish himself as a War Ace, but even gets to run down the same ex Commanding officer who is on horseback during a desperate forced landing.
It has the right amount of tongue in cheek, authenticity and humour to carry it off.
Hard to find, but worth the effoert.