This short book is published by Amazon as a kindle e-book
for £3.99 In fact it's not so much a book as a collection of three essays about Marlborough, Wellington and Slim bound together by an introduction and a conclusion which compares their respective military merits and suggests which one the author thinks was the greatest.
These are quite short essays but David packs a lot of detail in. He is especially good on the formative parts of their careers. I did not know much about Marlborough but I've read quite a bit about the Peninsular War and Waterloo but almost nothing previously about Wellington in Ireland and India and I've read Slim's Defeat into Victory and a number of other books about the Burma War but didn't know he was in Gallipoli or on the North West Frontier.