The story is set during the Napoleonic Wars and follows the adventures of a young British protagonist, Terence O'Connor, who joins the British army. The narrative centers around Terence's experiences as he becomes involved in the Peninsular War and serves under the command of Sir John Moore, specifically during the campaign leading up to the Battle of Corunna in 1809.Throughout the novel, Henty offers a historical account of the military campaigns, battles, and the challenges faced by soldiers during the Napoleonic era. The story focuses on Terence's bravery, resourcefulness, and loyalty as he navigates through the dangers and hardships of war.G.A. Henty was known for his meticulous research and ability to weave historical events into engaging adventure stories, educating young readers about different periods of history while providing thrilling narratives. "With Moore at Corunna" is one such example, offering a blend of historical accuracy and exciting storytelling set against the backdrop of the Napoleonic Wars.