Evelyn Waugh 
Unconditional Surrender [EPUB ebook] 
The Conclusion of Men at Arms and Officers and Gentlemen

Guy Crouchback has lost his Halberdier idealism. A desk job in London gives him the chance of reconciliation with his former wife. Then, in Yugoslavia, as a liaison officer with the partisans, he finally becomes aware of the futility of a war he once saw in terms of honour.