A sequence of candid letters written by a staff officer during the Peninsular campaigns, recounting daily life, military operations, and the practical work of organising allied Portuguese forces. Addressed to family and colleagues, the correspondence combines campaign reports, logistical detail, personal impressions of local character and government, and reflections on contemporary politics, offering a chronological, on-the-spot perspective on headquarters’ decision making and the hardships and routines of wartime service.