The War of the Oranges was a brief conflict in 1801 in which Spanish forces, instigated by the government of France, and ultimately supported by the French military, invaded Portugal. It was a precursor to the Peninsular Wars, resulting in the Treaty of Badajoz, the loss of Portuguese territory, in particular Olivenza, as well as ultimately setting the stage for the complete invasion of the Iberian Peninsula by French forces.

The Treaty of Badajoz is a peace treaty of the XIX-th century signed by Spain and Portugal on 6 June 1801. Portugal ceded the border town of Olivenza to Spain and closed its ports to British military and commercial shipping.