The most famous of Australian War Horses and his rider, Major Mike Shanahan is told in this book, on special in some major bookshops for around $23.

https://shop.abc.net.au/products/bill-the-bastard-pbk

There will also be a doco on Bill The Bastard on TV (ABC?) on Anzac Day.

I think they may be making a movie of it as well.  It was mentioned that Hugh Jackman may be playing the Major.

I am looking forward to reading it.    I read somewhere it may be available as an "E" book as well.