I'll throw in
"Covanent With Death" by John Harris - an account of a Kitchener Battalion from formation to 1st July 1916 (based heavily on 1st Sheffield Pals) seen through the eyes of one member of the Bn.
The "Brigadier Gerard" stories of Arthur Conan Doyle (there was a version in the late '60s, but it varied quite a lot from Doyle's books).
"The Candlemas Road" by George MacDonald Fraser - an account of a "Road" or raid by rievers on the English-Scottish border in the 16th Century and the events surrounding it (the book is a lot better than I've made it sound).

Walrus