Arthur and Mordred’s Battle on Salisbury Plain brings the struggle between king and usurper to its fatal conclusion. A proposed truce briefly seems to avert the fighting, but an accidental sword-drawing turns mistrust into open battle. By nightfall, the armies have been devastated; Arthur kills Mordred, but Mordred’s final blow leaves Arthur mortally wounded.

Background and the Attempted Truce

After Mordred’s revolt, Arthur gathered forces and moved toward Salisbury. The king’s followers and Mordred’s supporters included many of the kingdom’s knights, and the conflict divided former allies. Arthur assigned a day for the armies to meet on a plain near Salisbury, not far from the sea. The prospect of revenge against Mordred pleased him, though the approaching encounter carried danger for both sides.

On the night before the appointed battle, Arthur dreamed that he sat on a richly dressed chair fixed to a wheel above a deep, black water filled with threatening creatures. The wheel turned, and he fell among them. In a further vision, Gawaine appeared with women for whom he had fought while alive. He warned Arthur that fighting the next day would bring the deaths of the king and many others, and urged him to seek a month’s delay until Launcelot could arrive with his knights.

Arthur sent Sir Lucan the Butler, Sir Bedivere, and two bishops to negotiate. They offered Mordred lands and goods in exchange for a delay. Mordred accepted terms that granted him Cornwall and Kent during Arthur’s lifetime, with all England to pass to him afterward. The agreement offered a way to postpone combat, but neither side trusted the other: Arthur instructed his host to attack if it saw a sword drawn, and Mordred gave his forces a corresponding warning.

The Truce Breaks

Arthur and Mordred met between their hosts, each accompanied by fourteen people. They reached an accord and drank wine together. Then an adder emerged from a small heath bush and stung a knight. The knight drew his sword to kill it; the gesture was enough for both armies to believe that the truce had failed. Trumpets and horns sounded, and the hosts charged.

The battle lasted through the day. Arthur repeatedly rode through Mordred’s forces and fought with resolve, while Mordred also placed himself in great peril. The narration presents the fighting as a catastrophe extending far beyond the two leaders: by night, one hundred thousand lay dead on the plain. That figure makes the cost of the collapse of trust stark, as a minor accident triggers the destruction the negotiations had sought to defer.

Arthur and Mordred Meet

When Arthur surveyed the field, only two of his knights remained alive beside him: Lucan and Bedivere, both badly wounded. Mordred, too, was left alone among the dead. Lucan urged Arthur not to pursue him, recalling the warning in Arthur’s dream and arguing that the king had already won the field. If Arthur stopped, he might survive the day and take revenge later.

Arthur refused to leave Mordred alive. He took his spear and charged. Arthur struck Mordred beneath the shield, piercing his body; Mordred then drove himself farther onto the spear so that he could reach Arthur. With his sword, he struck Arthur on the side of the head, wounding him mortally. Mordred fell dead, and Arthur collapsed, repeatedly losing consciousness. Lucan and Bedivere lifted him and supported him to a small chapel near the sea.

Consequences and Narrative Significance

The battle destroys the possibility of a political settlement as well as the forces that might have sustained either ruler. Mordred’s death does not amount to an uncomplicated victory: Arthur has been mortally wounded, nearly all the knights are dead, and the surviving men are too injured to restore order. The battle’s decisive reversal lies in the contrast between the negotiated agreement and its immediate collapse, and between Arthur’s victory over Mordred and the fatal cost of achieving it.

Even the aftermath offers no calm ending to the fighting. From the chapel, Arthur sends Lucan to learn why people are shouting. Lucan finds robbers among the dead, stripping valuables from fallen knights and killing those who still live in order to take their armor and possessions. The scene extends the battle’s disorder beyond the armies themselves: with the king dying and the field unguarded, violence gives way to plunder. The fatal encounter on Salisbury Plain thus marks not simply the end of a battle, but the destruction of the fellowship and authority that might have contained its consequences.