G. A. Henty 
Under Wellington’s Command 

Historical novel set in Spain, where the British battled the French in the Napoleonic Wars. The Preface begins: ”As many boys into whose hands the present volume may fall will not have read my last year’s book, With Moore in Corunna, of which this is a continuation, it is necessary that a few words should be said, to enable them to take up the thread of the story. It was impossible, in the limits of one book, to give even an outline of the story of the Peninsular War, without devoting the whole space to the military operations. It would, in fact, have been a history rather than a tale; and it accordingly closed with the passage of the Douro, and the expulsion of the French from Portugal.’ According to Wikipedia: 'George Alfred Henty (8 December 1832 – 16 November 1902), referred to as G. A. Henty, was a prolific English novelist, special correspondent, and Imperialist born in Trumpington, Cambridgeshire, England. He is best known for his historical adventure stories that were popular in the late 19th century. His works include Out on the Pampas (1871), The Young Buglers (1880), With Clive in India (1884) and Wulf the Saxon (1895).’