Nabokov described this novella, written in Paris in 1939 but only published twenty years later, as 'the first little throb of Lolita'. The plot is similar: a middle-aged man wedding an unattractive widow in order to indulge his paedophilic obsession with her daughter.
Separated from his regiment during a retreat, Rifleman Matthew Dodd of Wellington's army engaged the French single-handedly and eventually causes their retreat. If you liked "The Gun," you will love this book.