He wrote a very good book called, “The River War” about fighting dervishes on the upper Nile. It was very good writing. I have not checked, but I think it was before the Boer War and what he wrote about that. Remember “Follow the biscuit.” Following it put him in good stead for what was needed in the second world war.
That book is available from Amazon (Kindle) fror free-
http://www.amazon.com/River-War-Account-Reconquest-Sudan-ebook/dp/B0084A08XW/ref=sr_1_3?ie=UTF8&qid=1451782022&sr=8-3&keywords=The+River+War+An+Account+of+the+Reconquest+of+the