The First Carlist War broke out after the death of King Ferdinand VII, the king restored at the end of the Peninsular War thanks to Wellington's victory. The crown was claimed by both his daughter Isabella, backed by the Liberal party and his brother Don Carlos, at the head of northern ultra-conservatives centered in the Basque provinces and Navarre. The Liberals or "Cristinos" were supported by a 10,000-strong British Legion of volunteers led by a former aide to Wellington as well as the British Royal Navy, a Portuguese division, and the French Foreign Legion. With both armies still using...