An often neglected aspect of Marlborough's war is its crucial campaign in Spain and Portugal, also known as the First Peninsula War of 1702–1712. Whilst this campaign was critical to the outcome of the war, relatively little information is available about it or the army that fought it. This work not only provides a detailed look at the army that fought the Spanish and Portuguese campaigns of Marlborough's war, but it also offers an insight into the course of the war in Iberia. It aims to provide more detail and understanding of a relatively little known part of a war that helped to shape and strengthened Britain's position amongst the main European players. Several chapters look at the national contingents that made up the confederate armies fighting in Spain and Portugal. The work concentrates not only on the reasonably well known British contribution but also on the equally important role of the less well known Austrian, Dutch, Palatine, Portuguese and Spanish contingents.