Follow in the footsteps of King Edward III as he crosses the English Channel to engage the French fleet
in the Zwin estuary near Sluys, modern day Sluis, in this the first clash of the Hundred Years War.
The Battle of Sluys took place in what is now the Zwin Nature Reserve. The Zwin consists of the entrance area of the former tidal inlet that during the Middle Ages connected the North Sea with the ports of Sluis (Sluys) and Bruges inland. Its tidal channel reached some 15 km inland and was connected, via another channel, to the mouth of the Scheldt further north east. The Zwin offered access to the North Sea to the inland city of Bruges, which consequently rose to become one of the foremost medieval port cities of Europe. In 1340 the Zwin estuary and harbour at Sluys was on the border between Zeeland and West Flanders. From the late 13th century onwards, the channel was affected by progressive silting that ultimately caused the waterway to become unusable and cut off the harbours of Bruges and Sluys from the sea.
Background to the battle
When Charles IV the Fair, King of France, died in 1328 he did not leave behind a male heir, having had
only daughters. The principle denying women succession to the French throne had been established in 1316
and as such Charles' daughters could not inherit the throne, which left the French throne
The closest living male relative of Charles IV was King Edward III of England. The fifteen year old Edward's claim was through his mother Isabella of France, Charles IV's sister, and Isabella claimed the vacant French throne for her son. The assemblies of the French barons, French prelates and the University of Paris debated this matter and resolved that males who derive their right to inheritance through their mother should also be excluded. Over the following century the French adopted a clause from the 6th century Pactus Legis Salicae, aka Salic Law, which asserted that no female or her descendants could inherit the French throne as a governing rule for the French succession.
King Edward III.
The closest living male relative to Charles IV in the male line was Philip, Count of Valois who was Charles' first cousin. The French nobility chose Philip to succeed Charles IV as the King of France and he was crowned as King Philip VI. The Plantagenet kings of England had become dukes of Aquitaine when Henry II of England had married Eleanor of Aquitaine in 1152 and from that point onwards the lands in Aquitaine were held in vassalage to the French crown. Edward III did not see himself as subordinate to Philip and refused to acknowledge Philip as his suzerain. Philip also clashed with Edward over Philip's interference in the King of England’s war against Scotland.
King Philip VI.
For nine years, it appeared that Edward had accepted Philip VI's ascendancy to the French throne, but
in 1337 Philip confiscated Edward's lands in Aquitaine, on the grounds that Edward had breached his
obligation as vassal. It was this, combined with Philip VI's interference in his war against
Scotland, that prompted Edward III to reassert his claim to the French throne and in 1340 Edward
formally assumed the title "King of France" and combined the French Royal Arms with the three
lions of England.
King Edward certainly saw his counterclaim as an opportunity to stir up trouble for Philip VI by encouraging French malcontents to recognise him as king. He may also have seen it as a powerful weapon in negotiation, by offering to renounce his claim in return for large territorial concessions, such as the return and independence of Aquitaine or even the cession of Normandy and Anjou, the other former French lands of the Plantagenet kings, on the same terms.
The opposing forces
Initially the French had the superior fleet, their galleys were ideal for swift passage across the
Channel under sail or oars, could penetrate shallow harbours and were highly manoeuvrable and ideal for
raiding or ship-to-ship combat. The huge French fleet was supplemented by galleys from Genoa and they
were able to disrupt English commercial shipping, particularly that of the Gascon wine and the Flemish
wool trades, as well as raiding the south and eastern coasts of England at will.
There was no English Royal Navy in the 14th Century and the English did not have a purpose-built navy. The principle type of English merchant vessel was the Cog, which was clinker-built, fitted with a single mast and a square-rigged single sail, and had a deep draught and round hull. They ranged from about 15 to 25 meters (49 to 82 feet) in length, had a beam of 5 to 8 meters (16 to 26 feet) and the largest could carry up to about 200 tons. Edward requisitioned a number of these ships from the merchant fleet and converted them into warships by adding wooden "castles" at the bow and stern, and a crow's nest platform at the masthead, from which archers could use bows or drop stones on to enemy craft alongside. The high freeboard of the Cog made it superior in close combat to the French galley allowing the English to look down on their French adversaries.
Edward III assembled his fleet in the River Orwell and River Stour near Harwich. He made the Cog Thomas his flagship and set sail on 22 June 1340 and was approaching Sluys by the afternoon of the following day. The English fleet anchored off Blankenberge and that evening King Edward sent Sir Reginald Cobham, Sir John Chandos, and Sir Stephen Lambkin to reconnoitre the French fleet. They found the French fleet anchored at the entrance of the Zwin estuary and ranged in three tightly packed lines that included the great cog Christopher, a captured English prize.
The French fleet is believed to have been around 200 ships; Edward in a letter to his son counts 180 sails and contemporary French documents record the fleet size as 204 vessels. Part of the fleet consisted of Genoese galleys serving as mercenaries under the command of Admiral Pietro Barbavera and the French fleet was under the command of the Breton knight Hugues Quiéret, admiral for the king of France, and Nicolas Béhuchet, the Constable of France.
Nicolas Béhuchet, the Constable of France.
The size of the English fleet is not accurately known as no contemporary records exist. It is believed that the English fleet that set sail from the Orwell consisted of 160 ships and that these were joined by the northern squadron led by Sir Robert Morley. In addition King Edward's Flemish allies are also reported to have joined the battle and it is thought therefore that the English fleet was somewhere between 120 and 320 ships in total.
The Battle of Sluys.
The French dispositions were made in accordance with the tactics for a fleet on the defensive at that
time. They were formed into three tightly packed lines chained together, with a few of the largest
vessels stationed in front as outposts. Admiral Barbavera was concerned that their lack of
manoeuvrability in the anchorage would leave them vulnerable to attack from the ship-based English
archers and he advised his French commanders to put to sea. Nicolas Béhuchet, who as constable
exercised general command, refused to leave the anchorage as Barbavera suggested.
King Edward III's intentions were well known, he wanted to sail up the Zwin to Bruges and there land his army to support his invasion plans. Many historians believe that Béhuchet's intention was to bar King Edward's way. King Edward’s ships entered the Zwin roadstead at high tide, 11.23 am, on 24 June 1340 and, after manoeuvring to windward, sailed towards the French fleet with the sun behind them.
Map showing the relative positions of the French and English fleets.
King Edward sent his ships against the French in groups of three; two ships were crammed with archers and
the third full of men-at-arms. The English ships with the archers would close on a French vessel and the
archers would rain arrows down on the enemy's decks. The English archers, with their long bows,
could accurately shoot 20 arrows per minute at a range of up to 270 metres (300 yards), whereas the
Genoese crossbowmen could only manage two bolts per minute and had a lot shorter range. While the enemy
vessel was so engaged, the ship carrying the men-at-arms would come alongside and the men-at-arms would
board and seize it. Because of how tightly the French vessels were packed together, the battle became
essentially a land battle at sea.
The English managed to board and seize many French vessels after fiercely contested hand-to-hand fighting. The Genoese crossbowmen managed to successfully board and capture two English ships. French sources asserted that Nicolas Béhuchet wounded King Edward III during the fighting, but there was no evidence, other than a legendary one, that a personal encounter between King Edward and the French commander. It is, however, a fact that the King was indeed wounded during the battle by either an arrow or a crossbow bolt.
Nicolas Béhuchet's tactics proved disastrous for the French, as it allowed the English to attack their left flank while leaving the rest of the fleet paralyzed. In a letter to his son, King Edward said that the enemy made a noble defence "all that day and the night after". By the end of the battle, the French fleet had been broken at the cost of only two English ships captured, and the water was reported to be thick with blood and corpses. The number of English losses is unknown, the French are thought to have lost between 16,000 and 18,000 and virtually all of their vessels were captured.
The aftermath of the battle
After the battle King Edward went on to lay siege to Tournai, a Flemish city that had been loyal to
Philip VI of France. Edward and his forces reached Tournai on 23 July 1340 and laid siege trapping,
apart from the inhabitants, a sizable French garrison inside. The siege dragged on and Philip VI with a
relieving army drew closer, while Edward was running out of funds to keep his army in the field. At the
same time, Tournai was running out of food.
King Edward's mother-in-law, Jeanne of Valois who was also Philip's sister, visited King Edward in his tent on 22 September and begged for peace. She had already made the same plea in front of Philip VI and consequently a truce, known as the Truce of Espléchin, was made on 25 September 1340 to bring the siege to an end without anyone losing face.
Touring the Battle of Sluys battlefield
A tour of the Battle of Sluys would normally form part of a larger Hundred Years War Tour, but it could also form a interesting tour visiting:
- Harwich Haven — Look out across the entrance to the River Orwell, this is where King Edward gathered together his fleet.
- Blankenberge Beach — The beach off which King Edward anchored his fleet on 22 June 1340.
- Zwin Nature Reserve — The reclaimed land that was the entrance to the Zwin estuary in 1340.
- Sluis — The Dutch town after which the battle is named.
- Tournai — The Flemish city that King Edward III laid siege to after his victory over the French at Sluys.
With the exception of Harwich, these places can be visited as a day-tour or part of a larger Hundred Years War Tour.
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Page last updated: 16 July 2021.