Battle of Aljubarrota
Part of the Portuguese Crisis of 1383–1385
Date August 14, 1385 Location Near Aljubarrota, central Portugal Result Decisive Portuguese victory
Combatants
Portugal with English allies	Castile with Portuguese and French allies
Commanders
John I of Portugal Nuno Álvares Pereira	John I of Castile
Strength
6,500 men	31,000 men

Portuguese Crisis of 1383–1385
Atoleiros – Trancoso – Aljubarrota

The Battle of Aljubarrota (pron. IPA [al.ʒu.βɐ.'ʁɔ.tɐ]) took place on August 14 1385, between the forces commanded by King John I of Portugal and his general Nuno Álvares Pereira, and the army of King John I of Castile. The place was São Jorge, between the towns of Leiria and Alcobaça in central Portugal. The result was a decisive defeat of the Castilians and the end of the 1383-1385 Crisis, establishing John as King of Portugal.

Portuguese independence was assured and a new dynasty, the House of Aviz, was established. Scattered border confrontations with Castilian troops would persist until the death of John I of Castile in 1390, but these posed no real threat to the new dynasty. To celebrate his victory and acknowledge divine help, John I of Portugal ordered the construction of the monastery of Santa Maria da Vitória na Batalha and the founding of the town of Batalha (Portuguese for "battle", pronounced /bɐ.'ta.ʎɐ/). The king, his wife Philippa of Lancaster, and several of his sons are buried in this monastery, which is an important part of Portuguese heritage.

Prelude

The end of the 14th century in Europe was a time of revolution and crisis, with the Hundred Years' War devastating France, the Black Death decimating the continent, and famine afflicting the poor. Portugal was no exception. In 1383, King Ferdinand I of Portugal died with no son to inherit the crown. The only child of his marriage with Leonor Telles de Menezes was a girl, Princess Beatrice of Portugal, married to John I, king of Castile. The Portuguese nobility was unwilling to support the claim of the princess because that would mean the incorporation of Portugal in Castile (see note 2). Without an undisputed option, Portugal remained without king between 1383 and 1385, in an interregnum known as the 1383–1385 Crisis. On April 6, 1385, the council of the kingdom (cortes in Portuguese) summoned in Coimbra and declared king John, Master of Aviz (bastard son of Peter I of Portugal). However, the Castilian king would not relinquish his wife's claim to the throne and invaded Portugal in June, with an important French cavalry detachment and a great part of the Portuguese nobility under his command.

Portuguese dispositions

After his accession to the throne, John I of Portugal proceeded to conquer the cities that supported Princess Beatrice and her husband's claims, namely Caminha, Braga and Guimarães among others. On the news of the invasion by the Castilians, John of Portugal's army met with Nuno Álvares Pereira (the Portuguese field marshal) in the town of Tomar. There, they decided to face the enemy in battle, before they could get close to Lisbon, capital of the kingdom.

Along with its English allies, which consisted of a company of English bowmen sent to honor the alliance between the kingdoms in the form of the marriage between John of Portugal and his Lancastrian queen, the Portuguese army set out to intercept the invading army near the town of Leiria. Nuno Álvares Pereira took the task of choosing the ground for the battle. The chosen location was São Jorge near Aljubarrota, in a small flattened hill surrounded by creeks, with a very small settlement at its widest point, still present today. At around 10 o'clock in the morning of August 14, the army took its position at the north side of this hill, facing the road where the enemy would soon appear. As in other defensive battles of the 14th century (Crécy, for example, or Poitiers), the dispositions were the following: dismounted cavalry and infantry in the centre with archers occupying the flanks, and notably a company of young nobles who left their studies at the university city of Coimbra and were remembered to history as The Flank of Lovers, invoking notions of chivalric brotherhood and honor. On either side, the army was protected by natural obstacles (in this case, creeks and steep slopes). In the rear, reinforcements were at hand, commanded by John of Portugal himself. In this topographically high position, the Portuguese could observe the enemy's arrival and were protected by a steep slope in their front. The rear of the Portuguese position, which was in fact its front in the final battle, was at the top of a narrow slope, which came up to a small village, and was further constricted by a complex series of interlocking trenches which were designed to surprise and trap cavalry. This trenching tactic was developed around this time and used extensively by both the English in France and the Portuguese in the rare set-piece battles of the Crisis of the Succession.

Castile arrives

The Castilian vanguard arrived at lunch time from the north. Seeing the strongly defensive position occupied by the Portuguese, John of Castile made the wise decision to avoid combat on John of Portugal's terms. Slowly, due to the numbers of his army (about 30,000 men), the Castilian army started to contour the hill where the Portuguese were located. John of Castile's scouts had noticed that the South side of the hill had a gentler slope and it was there that the Castilian king wanted to attack.

In response of this movement, the Portuguese army inverted its dispositions and headed to the South slope of the hill. Since they were fewer than the enemy and had less ground to cover, they attained their final position very early in the afternoon. To calm the soldiers' nervousness and to improve his army's defensive position, general Nuno Álvares Pereira ordered the construction of a system of ditches, pitches and caltrops. This tactical procedure, very typical of the English, was perhaps a suggestion of the English allied troops, also present in the field.

Around six o'clock in the afternoon the Castilian army was ready for battle. According to John of Castile's own words, in his report of the battle, his soldiers were by then very tired from the march that started early in the morning under a blazing August sun. There was no time to halt now, and the battle would soon begin.

Battle

The initiative of starting the battle was on the Castilian side. The French allied cavalry charged, as they were accustomed to do: in full strength, in order to disrupt order in enemy lines. Even before they could get in contact with the Portuguese infantry, however, they were already disorganized. Just like at Crécy, the defending archers along with the ditches and pits did most of the work. The losses on the cavalry were heavy and the effect of its attack completely null. Support from the Castilian rear was late to come and the knights that did not perish in the combat were made prisoners and sent to the Portuguese rear.

At this point the main Castilian force entered the battle. Their line was enormous, due to the great number of soldiers. In order to get to the Portuguese line, the Castilians had to disorganize themselves, to squeeze in the space between the two creeks that protected the flanks. It was not an auspicious start. At this time, the Portuguese reorganized. The vanguard of Nuno Álvares Pereira divided into two sectors. Since the worst was still to come, John of Portugal ordered the retreat of the archers and the advance of his rear troops, through the space opened between the vanguards. With all troops needed at the front, there were no men available to guard the knight prisoners. John of Portugal ordered them to be killed on the spot and proceeded to deal with the approaching Castilians.

Squashed between the Portuguese flanks and advanced rear, the Castilians did their best to win the day. At this stage of the battle, both sides sustained heavy losses, especially on the Castilian and Portuguese left wing (known in Portuguese tradition as the Ala dos Namorados, meaning, not literally, flank of the lovers). By sunset the Castilian position was indefensible and the situation quite desperate. John of Castile ordered retreat and the remaining Castilian soldiers started to flee. Portuguese pursued them and, with the battle won, killed many more.

According to Portuguese tradition surrounding the battle, there was a woman called Brites de Almeida, the Padeira of Aljubarrota (the baker-woman of Aljubarrota), said to be very tall, strong, and to possess six fingers on each hand, who ambushed and killed by herself eight Castilian soldiers as they stormed her bakery in the town of Aljubarrota itself. This story in particular is clouded in legend and hearsay. But the popular intervention in the massacre of Castilian troops after the battle is, nevertheless, historical and typical of battles between nations in this period, as in the Hundred Years' War.

Aftermath

In the morning of the following day, the true dimension of the battle was revealed: in the field, the bodies of Castilians were enough to dam the creeks surrounding the small hill. John of Castile himself had to run at full speed to save his life. Behind him he was leaving not only common soldiers but also many noblemen, causing official mourning in Castile that would last until the Christmas of 1387. The French cavalry contingent suffered yet another defeat (after Crecy and Poitiers) by English defensive tactics. The Agincourt decades later would show that they still had a lesson to learn.

With this victory, John of Aviz was the uncontested King of Portugal. Independence was assured and a new dynasty, the House of Aviz, started. Scattered border skirmishes with Castilian troops would persist until the death of John of Castile in 1390, but posed no real threat to the Portuguese crown. To celebrate his victory and acknowledge divine help, John of Portugal ordered the construction of the Monastery of Santa Maria of Batalha, and the founding of the town of Batalha (battle in Portuguese). The king, his wife Philippa of Lancaster, and several of his sons are buried in this Monastery, an important part of Portuguese heritage.

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