Iberian Union - Restoration War and The End of The Union

Restoration War and The End of The Union

The subsequent Portuguese Restoration War against Philip III (Portuguese: Guerra da Restauração) consisted mainly of small skirmishes near the border. The most significant battles being the Battle of Montijo on May 26, 1644, the Battle of the Lines of Elvas (1659), the Battle of Ameixial (1663), the Battle of Castelo Rodrigo (1664), and the Battle of Montes Claros (1665); the Portuguese were victorious in all of these battles.

Several decisions made by John IV to strengthen his forces made these victories possible. On December 11, 1640, the Council of War was created to organize all the operations. Next, the king created the Junta of the Frontiers, to take care of the fortresses near the border, the hypothetical defense of Lisbon, and the garrisons and sea ports. In December 1641, a tenancy was created to assure upgrades on all fortresses that would be paid with regional taxes. John IV also organized the army, established the Military Laws of King Sebastian, and developed intense diplomatic activity focused on restoring good relations with England. Meanwhile, the best Spanish forces were pre-occupied with their battles against the French in Catalonia, along the Pyrenees, Italy and the Low Countries. The Spanish forces in Portugal never received adequate support. Nevertheless, Philip IV felt he could not give up what he regarded as his rightful inheritance. By the time the war with France ended in 1659, the Portuguese military were well established and ready to confront the last major attempt of a worn out Spanish regime to reclaim control.

After gaining several decisive victories, John quickly tried to make peace. His demand that Philip recognize the new ruling dynasty in Portugal was not fulfilled until the reign of his son Afonso VI during the regency of Peter of Braganza (another son of John and later King Peter II of Portugal).