The Relation of England with Portugal in the XIV century

The One Hundred Years War, between England and France, began in 1337. Once this war began, the castilian Kingdom became the main ally of France. Portugal, independent since 1144, had within the context of this War an important strategic position, since it represented the west flank of the European conflict.

In 1367, D. Fernando became King of Portugal. After 1369, D. Fernando engaged in three wars with Castile, as he considered himself entitled to the throne of Castile, since he was the great grandson of D. Sancho, the Brave, a previous King of Castile. For this purpose, he had the support of several noblemen from Galicia. Within the context of these wars, in July 1371, D. Fernando signed the Treaty of Tagilde with John of Gaunt, the Duke of Lancaster, who was the third son of Edward III, King of England.

This Treaty was the first political and military alliance between Portugal and England, and created the foundations of the alliance between the two countries that still exists today. Under this Treaty, Portugal would help John of Gaunt attack Castile, by land and sea, in order to place his wife as the Queen of Castile, and the portuguese King would have no claim to the castilian lands. In relation to the kingdom of Aragão, its lands would belong to John of Gaunt or to Portugal, depending of whom would conquered it first.

John of Gaunt was married to D. Constanza, daughter of the previous King of Castile, D. Pedro I, and therefore considered himself to be entitled to the throne of Castile. He also wanted to attack Castile, as the present King, D. Henrique II, had killed his wife’s father, D. Pedro I.

The Treaty of Tagilde prompted an invasion of Portugal by Henrique II, King of Castile, in 1372. Lisbon was besieged and partly occupied for a month. After several negotiations, King D. Fernando agreed to support Castile and France, in the One Hundred Years War.

However, in 1380, D. Fernando made a new agreement with Edmund, the Count of Cambridge, son of Edward III, therefore brother of the Black Prince, the Duke of Lancaster. Under this agreement, D.Beatriz, the only daughter of D. Fernando, would marry Edward of Langley, the son of the Count of Cambridge. This enabled an english fleet of 48 ships, to transport 1.000 archers and 2.000 armed men to Portugal, which disembarked in Lisbon in July 1381. This was the first time that England had a military presence in Portugal. With these men came, not only Edmund of Cambridge and his family, but also experienced captains from the One Hundred Years War, and several figures from the english Court. This army marched to the border of Portugal with Castile, in Alentejo and in July 1382, the portuguese and the castilian armies came face to face, near the River Caia. The One Hundred Years War was very apparent in this conflict, since the portuguese King was supported by the referred 3.000 english warriors, and many french cavaliers and footmen supported the castilian King, D. Juan I. This battle did not take place however, as castile agreed to return several castles and all the portuguese prisoners. In return, D. Fernando agreed that his only daughter, D. Beatriz, would marry the King of Castile. This treaty was not well received by the english expeditionary force, which were expecting the benefits of a military victory. It was also not welcomed by the portuguese people, who saw the threat of a possible political union with Castile. Due to this treaty, the english expeditionary force returned to England, in September 1382.

An important event took place however in this period, since Nuno Álvares Pereira, who would later become the commander of the portuguese army, was then a regular soldier in this army, so he was able to talk extensively with the english soldiers from whom he learned the military techniques used in the One Hundred Years War, which included the preference for fighting on foot rather than on horse, the choosing of a favourable battleground, the installation of defence obstacles on the ground, and the extensive use of archers. Nuno Álvares would later use, with great success, these military techniques during the war against Castile, that would last for 31 years, between 1383 and 1411.

In May 17th 1383, in the city of Badajoz, due to the Treaty of Salvaterra, took place the marriage between the King of Castile, D. Juan I, then 25 years old, with the portuguese princess, D. Beatriz, then only 10 years old.

King D. Fernando died in October 1383. This created a period of political uncertainty, as the wife of the castilian King, D. Beatriz, would be the Queen of Portugal. Also, the castilian king began calling himself King of Portugal. With the general support of the portuguese people, D. João, Mestre de Avis, half brother of King D. Fernando, tried to prevent the union of the kingdoms of Portugal and Castile, and took possession of several cities, such as Lisbon and Oporto. Aware of this unrest, the King of Castile, D. Juan I, invaded Portugal, in January 1384, in order to gain the portuguese throne.

Knowing that his military forces were still small, Mestre de Avis again tried to form an alliance with England. Mestre de Avis knew that the castilian fleet was supporting France in the One Hundred Years War, and that it would be important for England to keep the portuguese ports open to english ships. In this context, Portugal could be an important ally of england, namely due to its strong military fleet.

Therefore, still in December of 1383, D. João Mestre de Avis, after being elected Regent and Defendor of the Kingdom of Portugal, sends an embassy to England, that sails in February of 1384 in two ships, composed of Lourenço Martins, the englishman Thomaz Daniel, Fernando Albuquerque and Lourenço Eanes de Fogaça. As refereed before, Portugal had then a signed treaty with England, the Treaty of Tagilde, since 1372. Eight days later they arrived at a english village called Preamua. They then went to London on horse, where they were received by King Richard II, and by the nobles of the Court. The King of England then ordered a council in the city of Salisbury, where the portuguese emissaries could present their demands. The Duque of Lancaster also joined this meeting, after returning from France where he was taking part in the One Hundreds Years War. The portuguese emissaries then asked for assistance in the war against Castile, referring that Portugal would support, in political and military terms, the claims of the Duque of Lancaster to the throne of Castile. The King of England then decides to write a letter to D. João, Mestre de Avis, referring that England will allow the recruiting of archers and armed men, which due to the war England has with France, would not be granted to any other country.

The portuguese emissaries were able, in May of 1384, to recruit approximately 800 archers and armed men, who arrived in Portugal in April of 1385, just before the decive Battle of Aljubarrota. For the payment of this recruitment, contributions also came from englishmen, such as the Mayor of London, Mosse Nicole, and the knight Henry Bivembra, who granted 3.500 nobles, as well as from other englishman accordingly to their financial capabilities.

At the end of 1384, four experienced English squires were also contracted by Portugal. They were Elie de Blythe, Robert Grantham, Peter Cressingham, and Reginald Cobham.

Since however he wanted to take immediate possession of the Portuguese Kingdon, D. Juan I of Castile, broke the terms of the Treaty of Savaterra, that stated that his wife could only became Queen at the age of 14 years old, and decided to invade Portugal in January of 1384. Due to the castilian invasion of Portugal, Lisbon was under siege by the castilian army and fleet, between May and September 1384. However, due to portuguese resistance, the castilian army returned home in September.

In April 1385, the English mercenaries finally arrived in Portugal. According to a study conducted by Prof. A. Stott Howorth, in 1960, these mercenaries were mainly from the middle and lower social classes, some of them with reasons to leave England. However they were experienced warriors, who had already fought in Portugal or in France. They were transported in four ships, which sailed from Plymouth on the 24th of March. These ships belonged to a Dartmouth ship owner, Edmund Arnald, and they also carried wheat, and pork meat, for the supply of the English armed men. These ships arrived in the ports of Oporto, Lisbon and Setúbal. Although the two ships that arrived in Lisbon were attacked by twelve castilian galleys, the english warriors were able to disembark and join the portuguese army.

Altogether, this transport included 650 men, of which approximately 450 were archers and 150 armed men. Due to an investigation undertaken in 1959 by Sir Peter E. Russell, from the University of Oxford, it is possible today to know the names of these Englishmen, through a document called “Public Record Office”, written in the XIV century.

This group of english warriors was in accordance with the agreement signed, in 1384, between the emissaries of Mestre de Avis and Richard II, King of England. Due to this agreement, Portugal also sent six galleys to the River Thames, in order to protect London from a possible castilian attack. These ships were 40 meters long, 7 meters wide, and had each approximately 260 men on board, including rowers and armed men. These portuguese ships soon destroyed twenty-four french merchant ships, showing their superior mobility and military power. This portuguese naval victory, together with the strength showned by the portuguese fleet, contributed to consolidate the relation between Portugal and England.

The english mercenaries arrived in Portugal in the same month as Mestre de Avis was elected King, at the Courts of Coimbra. The english military force arrived in Portugal just when it was most needed, as by then, it was already known that another castilian invasion would take place, and that a decisive occasion would occur in the military conflict between Portugal and Castile.

These mercenaries participated, most likely, in May 1385, in the northern campaign of Portugal, conducted by D. João I, namely in the conquest of the castles of Braga and of Ponte de Lima.

In June 1385, D. Juan I of Castile invaded Portugal, through the city of Guarda, with an army of 42.000 men. This army included 2.000 French cavaliers, which the castilian King received from France, as a result of its involvement in the One Hundred Years War.

The portuguese war council held a meeting, on August 8th, in Abrantes, 100 Km outside Lisbon, to discuss its strategy. Nuno Álvares Pereira argued that a decisive battle should be forced, since Lisbon would not be able to sustain another siege from such a strong castilian army. He declared that the help of the english archers would be an important factor. Although an immediate agreement was not reached, the portuguese decided, two days later, to fight a decisive battle against the castilians.

The portuguese army, composed of approximately 9.000 men, then advanced to the fields of Aljubarrota, in order to intercept the march of the castilian army towards Lisbon. With all probability, all the english archers then present in Portugal, took part in this march. The portuguese army, camped, on the 12th of August, outside the village of Porto de Mós, and on the 14th of August, 1385, was located in the fields of Aljubarrota, where the decisive battle was about to take place.

All the english archers were placed on the advance right wing of the portuguese army, in order to aim at the advancing french cavalry, and at the castilian army. The effect of their arrows was extremely important during the battle, since they could hit the enemy within a range of 350 meters. Each of these english archers was able to throw 12 arrows per minute. Since the archers that were present in Aljubarrota were all very experienced, we can conclude that close to 600.000 arrows were released by these archers in the Battle of Aljubarrota. This had a very significant effect on the outcome of the battle, since these arrows hit both horses and men of the advancing french-castilian army, without distinction. The english archers and armed men also played another important role in the battle. Once the advancing castilians breached the portuguese vanguard, the english archers and armed men abandoned their initial positions, and engaged in hand to hand fighting with the castilian armed men. Through a hard battle, and together with the portuguese men, they were able to eliminate and drive back all the incoming castilians.

It must also be said that the tactic used by the portuguese army, led by Nuno Álvares Pereira, was greatly influenced by english warfare of the One Hundred Years War. In effect, during previous periods of the Middle Ages, battles were decided by charges of heavy cavalry. After the XIV century, the english introduced the tactic of choosing the ground well, waiting for the enemy with every man on foot, building obstacles such as pit holes, trees on the ground and ditches, and profiting from the thousands of arrows released by the archers. The portuguese commander learned this new tactic well from the british army, while he was only a soldier in D. Fernando’s army. In effect, while living with the Count of Cambridge´s army, during 1381 and 1382, Nuno Álvares Pereira was able to discuss this new tactic, and to analyse its effectiveness. In the Battle of Aljubarrota, he applied this new tactic with perfection.

During 1384 and 1385, several battles took place between the portuguese and castilian armies, throughout different parts of Portugal and Castile. In these battles and in smaller military confrotations the brilliant portuguese commander, Nuno Álvares Pereira, was always successful. It was also due to the experience gained in the One Hundred Years War, why some of those english armed men, present at the Battle of Aljubarrota, advised the King of Portugal to stop pursuing the fleeing castilians in the last moments of the battle. In effect, to continue pursuing the enemy could expose the portuguese army to a dangerous castilian counter attack. It was therefore considered more appropriate to stay in the initial position, and assure a portuguese victory.

After seeing his army defeat, D. Juan I, King of Castile, returned home by sea. The rest of the army, returned to castile, through different routes. Never again would the King of Castile be able to organize such a big army and invade Portugal.

The result of the Battle of Aljubarrota made a strong and durable alliance between Portugal and England possible. With the news of this victory, the portuguese ambassadors, who had been in England for a year, could then propose to the English Court, a vast political and military alliance with the most western of the European countries – Portugal. Having legitimate claims to the castilian throne, John of Gaunt, Duke of Lancaster, then obtained permission from the King of England, Richard II, to prepare for a significant military expedition to the Iberian Peninsula, in coordination with the Portuguese King.

In May 1386, the two kingdoms signed, in Windsor, a famous treaty, the Treaty of Windsor, which was followed, a few months later, by the marriage of the portuguese King, D. João I, with the daughter of John of Gaunt, D. Philippa of Lancaster. D. Philippa was then the direct cousin of the King of England, Richard II. Under this Treaty, both countries would defend each other, in case of an attack, and commerce between the countries would be promoted.