Robert Curthose vs Henry I: The Trap at Tinchebray

A Norman Hillside in 1106 (0:00)

Hey, chibis! I'm Aiwee, and today we're talking about the battle of Tinchebray and the end of Norman partition. If you enjoy stories like this, hit the like button and subscribe if you haven't already — let's go! Picture a hillside in Normandy, late September, eleven hundred and six. On one side, a king who already wears the English crown, his army drawn up in three lines, most of his horsemen standing on foot to look like ordinary soldiers.

On the other side, his elder brother, the duke, charging at the head of Norman heavy cavalry, certain the field is his. Hidden in the trees at the back of the royal line, a small mounted reserve of Breton riders waits, under the command of Count Elias of Maine. The duke's charge nearly breaks the first royal line. The king's second line steps in. Then the Bretons swing around the flank, and the reserve line under Robert de Bellême, instead of sweeping in to rescue the duke, turns and rides away.

Within a single afternoon, nineteen years of partition are over. The man who came out of that field would wear both crowns for the rest of his life. The man who went into a cell would never come out. To understand how three brothers reached that field, you have to start almost twenty years earlier, with a single fall from a horse outside a town called Mantes. In the summer of ten eighty-seven, King William of England crossed into Normandy at the head of an army.

The campaign's aim was to secure overlordship of the French county of Vexin, which bordered his own holdings. While his forces were besieging the town of Mantes, the king was gravely injured when he fell from his horse. On his deathbed, he ordered his realm to be divided between his sons in keeping with custom. His eldest, Robert Curthose, took the duchy of Normandy, despite a history of rebellion against his own father.

A Fall Outside Mantes (2:00)

His second son, William, took England and the title of king. The third son, Henry, was given a sum of money and no lands at all. Two brothers left the deathbed with realms. One left with a purse. The partition did not even last a year.

William, now William the Second, crossed the Channel to England, first hurrying to Winchester to seize the royal treasury, and then on to London, where he was crowned on the twenty-sixth of September. Before the year was out, Robert Curthose, backed by a coalition of Anglo-Norman barons, openly rebelled. Many of those barons held property and castles on both sides of the Channel, and feared that whichever brother they angered would strip them of one set of lands or the other. They chose Robert, hoping he would unify the crown in their favor. The rebellion was led in part by Bishop Odo, one of the late king's half-brothers, and at first seemed to enjoy a significant numerical advantage.

What broke the rebellion was not the king's sword. It was money. Duke Robert ran out of funds to pay his followers and was forced to borrow from his youngest brother Henry. Henry agreed, in return for the countship of Western Normandy. Robert used the money to strengthen his English backers, but William the Second countered by winning over many of those same barons with bribes and promises of great rewards.

He besieged and captured Bishop Odo at Pevensey. Bad weather scattered the Norman invasion fleet. By July of ten eighty-eight, William had also taken Rochester Castle, and with Robert failing to appear in person, the rebel barons submitted. The duke himself was pardoned, allowed to stay in England, and permitted to keep his Norman possessions, on condition that he acknowledge his brother as rightful king. The next twelve years were William's.

He kept both clergy and nobility under tight control, and built an effective administrative system.

The Barons Pick Robert (4:00)

On his frontiers, he turned back a Scottish incursion, bolstered his standing in Wales, and led a campaign in northern France that met with mixed results. His reign was a working machine. It was also a house without an heir. William died unmarried, with no acknowledged children. In August of eleven hundred, while hunting in the New Forest, he was struck in the lung by an arrow and killed, under circumstances the chronicles of the time describe as unclear.

A nobleman accompanying the hunt was said to have been the one who shot him, though no contemporary source could agree on whether the shot was accident or something else. What mattered for the realm was that there was no adult male heir of the Conqueror's line on English soil. Henry was the first to move. He rode hard for Winchester, won over the barons there, occupied Winchester Castle, and seized the royal treasury for himself. He was then crowned at Westminster Abbey as Henry the First.

To bind his new vassals to him, he issued a Charter of Liberties at his coronation, pledging to curb the excessive taxation of the barons, correct the mismanagement of vacant bishoprics, and outlaw the sale of church offices and the accumulation of multiple benefices, presenting these as abuses that had grown under his brother's reign. He gave lands to his supporters, drew leading figures from William's court into his own service, and locked up Ranulf Flambard, the Bishop of Durham, in the Tower of London on corruption charges. To cement his legitimacy, Henry married Matilda of Scotland, daughter of the late Scottish king and a descendant of the old Anglo-Saxon House of Wessex. The new settlement was barely in place when it was tested. In February of eleven hundred and one, Flambard escaped the Tower, crossed to Normandy, and offered his services to Robert Curthose, who had by then returned from the First Crusade.

William the Second Reigns (6:00)

With Flambard's help, the duke mobilized an army and a fleet, claiming the English throne on the basis of a short-lived agreement he had once had with the late William. Henry responded by seizing Flambard's English lands and stripping him of his bishopric, then holding court twice to renew his barons' oaths. He massed a fleet and an army outside Pevensey, near where he expected the invasion to land, and is said to have trained some of the troops himself. Robert, however, did not land at Pevensey. He came ashore further west, at Portsmouth, with only a few hundred men, and was soon joined there by many of the very English barons whose oaths Henry had just renewed.

Instead of pressing straight on to Winchester and the treasury, Robert delayed. Henry marched west and intercepted him before he could move. The two armies met near Alton. Instead of fighting, the brothers negotiated. The resulting Treaty of Alton forced Robert to acknowledge Henry as king.

Henry renounced any claim to the rest of Western Normandy except for the town of Domfront, and promised Robert an annual pension. If either brother died without a male heir, the other's lands would pass to the survivor. Each was also bound to come to the other's military aid. Henry then turned on the barons who had wavered. Among the most powerful was Robert de Bellême, Earl of Shrewsbury, who had gone over to Robert.

The king accused de Bellême of around forty-five separate offenses. When the earl refused to answer to them, Henry besieged and captured his English castles and drove him into exile in Normandy. To lock down the duchy, Henry married two of his illegitimate daughters to local Norman nobles, and handed out English estates and rich gifts to the Norman lords whose support he most needed. According to the Treaty of Alton, Robert was meant to be fighting de Bellême for Henry.

Henry's Coronation Charter (8:00)

By eleven hundred and four, however, the duke was worn down, forced to capitulate, and then drew de Bellême into an alliance, exactly the move Henry had feared. The king read this as a violation of the treaty. In eleven hundred and five, he sent a personal friend to Normandy with a small force of knights, knowing the man would be detained. The detention gave him the pretext he wanted. He had already won the loyalty of most of the Norman baronage, and persuaded King Philip of France to stay out of the fight.

In eleven hundred and five, Henry landed in Western Normandy, occupied it, and advanced on the city of Bayeux. When Bayeux refused to surrender, his forces burned it. Caen, some twenty-four kilometers to the east, changed sides and submitted, plainly to avoid the same fate. Henry then pressed south to Falaise, which resisted. What happened at Falaise that year is one of the genuine open questions of the period.

Some sources say Henry had to abandon the siege because his soldiers were deserting. Some say he ran out of money. Others claim the siege was in fact completed. The campaign stalled, and Henry had to return to England. Even so, his Norman foothold was real.

Most of the duchy outside the ducal heartlands now bent toward him. Henry settled some religious disputes that had been blocking his military efforts, and in July of eleven hundred and six he invaded again, landing with a modest force near Caen. He struck first at the fortified abbey of Saint-Pierre sur Dives. Word reached him that an enemy garrison inside the abbey was planning to ambush him, so he marched on it by night and assaulted it in the early morning. Some of the abbey buildings were set alight.

A ducal reinforcement sent out from Falaise turned back rather than enter the burning precinct. With the abbey in his hands and some of the duke's leading supporters taken prisoner, Henry chose not to renew the siege of Falaise. Instead he turned southwest, against the castle of Tinchebray. When Henry reached Tinchebray, he began a formal siege.

Robert Lands at Portsmouth (10:00)

A siege tower was built, but the force was too small to stop the defenders from being resupplied, so he drew up the rest of his army and cut off every approach. Duke Robert, hearing of the invasion, marched to relieve the castle, with Robert de Bellême at his side, and made camp at what he thought was a safe distance by late September. The brothers parleyed one last time. Henry refused to lift the siege. The duke had no choice but to fight.

Robert arrayed his forces in two lines. On the right of the first line he placed his Norman heavy cavalry. On the left he placed his infantry. De Bellême commanded the second line, held in reserve to rescue the first if it faltered. Henry had a slightly larger army, drawn up in three lines, and he had many more horsemen than his brother.

To hide that advantage he ordered most of his cavalry to dismount, so the duke would see what looked like a purely infantry force before him. The mounted men who remained in the saddle were formed into a hidden reserve under Count Elias of Maine, drawn mostly from Brittany. The ruse worked. Seeing no enemy horsemen to oppose him, the duke launched his Norman knights in a fierce frontal charge. They hit Henry's first line so hard that it nearly broke.

Henry's second line stepped in to steady the first. The two armies locked together in a heavy melee. Then Henry gave the order, and the Breton horsemen burst from their hiding place and swept around the flank, hitting the engaged Norman cavalry from the side. At that critical moment, the reserve line under de Bellême, which the duke had been counting on to turn the day, instead turned its back and rode off the field. Robert's infantry broke and fled.

The duke himself, together with his remaining knights, was surrounded and taken. Henry's losses, by the chronicle accounts, were minor. The rest of Normandy fell in quickly. The remaining ducal garrisons surrendered. Lesser prisoners taken at Tinchebray were released.

The Treaty of Alton (12:00)

Robert Curthose and several other leading nobles were imprisoned indefinitely and never freed. Henry entered the Norman capital of Rouen, reaffirmed the duchy's laws and customs, and received the homage of its leading barons and citizens as the new Duke of Normandy. The settlement was not entirely tidy. Robert Curthose's son, William Clito, was only about three years old at the time of the battle. Henry released the child into the care of Helias of Saint-Saens, a Norman baron, a decision that would cause him trouble in later years.

Robert de Bellême, having handed back the ducal lands he had grabbed after his flight at Tinchebray, was drawn into the royal court rather than destroyed. England's king was now, in practice, Normandy's duke. The nineteen years of partition were over. What carried Henry through was not a single stroke of genius, but a steady accumulation of moves. He used money to win barons, used oaths to bind them, used marriage to lock down allies, used the threat of burning cities to win Norman towns without long sieges, and held his cavalry in reserve to catch a charging enemy at Tinchebray.

The death of William the Second in the New Forest handed him the English crown almost by accident. The Treaty of Alton in eleven hundred and one bought him five more years. The eleven hundred and five burning of Bayeux and the contested siege of Falaise bought him a foothold in the duchy. The ambush outside Tinchebray finished the war. The reunification was real, and it was paid for in cash, in charters, in marriages, and in the long captivity of the elder brother who had never quite learned to wait.

The boy handed over to Helias of Saint-Saens, and the barons who bent rather than broke, would carry the story forward into the next generation. But the war between the Conqueror's own sons was, at last, over.

A Foothold in Normandy (14:00)

If this walk through the nineteen years between Mantes and Tinchebray sharpened your picture of the Norman inheritance, the next chapter traces how a single shipwreck tore that settlement apart again and pushed England into a long civil war. Subscribe to follow that story when it goes live, and leave a comment with the moment in the nineteen years that surprised you most. Thanks for listening.