The
invasion of Portugal (19–30 November 1807) saw an
Imperial French corps under
Jean-Andoche Junot invade Portugal, which was headed by its Prince Regent
John of Braganza. The military operation resulted in the almost bloodless occupation of Portugal because its government lacked the will to resist. However, the French presence was challenged by the Portuguese people and by the
United Kingdom in 1808. The invasion marked the start of the
Peninsular War, part of the
Napoleonic Wars.