The Battle of Ewloe, also known as the Battle of Coleshill, was fought in July 1157 near Ewloe in what is now Flintshire, north-east Wales, between the Anglo-Norman forces of King Henry II of England and an army led by the Welsh prince Owain Gwynedd. Henry had assembled a considerable force at Chester following his accession to the throne in 1154, intent on reasserting royal authority over Wales and reversing Owain's recent territorial gains in Tegeingl, the disputed north-eastern cantref that Owain had steadily extended since inheriting Gwynedd from his father in 1137. Henry's allies included Madog ap Maredudd of Powys and Owain's own estranged brother Cadwaladr ap Gruffudd, giving the campaign a markedly dynastic character.
Owain adopted a forward defensive position near Coleshill, anticipating a pitched engagement, and the precise location of that position remains a matter of scholarly debate. Henry sent the bulk of his army directly towards Owain's entrenched line while himself leading a lighter flanking detachment through the wooded terrain of Hawarden. Owain had foreseen this manoeuvre and stationed a Welsh force in the woods under his sons Dafydd ab Owain Gwynedd and Cynan ab Owain Gwynedd. The English column walked into an ambush and suffered heavy losses. Among the dead was Eustace fitz John, Constable of Chester. During the fighting, the royal standard was dropped by the standard-bearer Henry of Essex, causing a brief but dangerous belief among the troops that the king himself had fallen; it was Roger, Earl of Hertford who retrieved the standard. Accounts differ as to whether Henry ultimately pushed through Owain's main line or was forced to retreat and regroup.
Owain, apparently fearing a double envelopment, withdrew rather than pressing his advantage, and eventually agreed to a peace settlement. He surrendered Tegeingl to Henry and restored Cadwaladr's lands in Ceredigion, yet the degree of his submission is contested: Welsh sources record only a peace agreement, not an act of homage, and Owain continued to use royal titles afterwards, which historian Huw Pryce interprets as a sign that he implicitly rejected Henry's overlordship. Henry's difficulties were compounded when he reached Rhuddlan and learned that his naval expedition to Anglesey had also failed, with its commander Henry FitzRoy killed. In 1160, Owain wrote to King Louis VII of France asserting that he had inflicted greater losses on Henry's army, a claim that illustrates how the Welsh regarded the outcome of the campaign.
The moment that came closest to transforming a costly ambush into a catastrophe for the English crown was the dropping of the royal standard in the woods of Hawarden. The standard-bearer Henry of Essex let the banner fall during the fighting, a act that spread immediate panic among the troops who took it as proof that King Henry II had been killed. According to the chronicle of Jocelyn de Brakelond, which drew on testimony from Essex himself, it was Roger, Earl of Hertford who seized the standard and rallied the situation, preventing what might have become a rout. The episode haunted Henry of Essex's reputation long afterwards, and the battle's chaos in those Flintshire woods left the king, in the words of one historian, escaping only with difficulty.
English losses described as heavy; Eustace fitz John, Constable of Chester, was killed; Henry FitzRoy, commander of the English naval expedition, was also killed during the separate action on Anglesey; Welsh casualties not recorded.
Henry II's army was described by William Stubbs as potentially including as much as one third of the knights in England, supplemented by archers and a naval force; the Welsh force is unknown in size, though one version of the Brut y Tywysogion states it was ten times smaller than Henry's.
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