War of Roussillon, also called War of the Pyrenees or War of the Convention, (1793-1795). Conflict between the Spain of Charles IV and the First French Republic. Spain, Biscayan uprising. In order to contain the advance of the French enemy, a mass levy was ordered, comprising all citizens capable of taking up arms from the age of 17 to 60 years old. Engraving. Historia del Levantamiento, guerra y revolucion de Espana by the Conde de Toreno. Madrid, 1851. (Photo by: Prisma/Universal Images Group via Getty Images)