The siege of Chartres was part of the Viking incursions. In 858, Norsemen raided and burned down the Burgundian city of Chartres (now in the Eure-et-Loir department of France). After that, the town's defenses were rebuilt and strengthened. It turned into a fortified, trapezoid-like city, going close to the river.

In 911, Rollo led the Danes in another siege of the city. Richard, Duke of Burgundy, split his forces into three corps, the first being made up of Aquitanians, to defend it. According to legend, Bishop Gantelme exposed the Virgin's tunic on the ramparts and led a mob of peasants to charge, and the Norsemen fled as a result.The West Frankish cavalry led by King Charles the Simple, which had arrived, now pursued the Norsemen. Short on time to be able to board his army onto his ships due to the rapid approach of the cavalry, Rollo and his men decided to make a defensive wall by slaughtering the livestock from his ships. The Frankish charge was halted as their horses were intimidated by the sight and smell of the livestock corpses.

The Franks, unable to attack, decided to instead open negotiations with Rollo. The Danes had been formidable enough to persuade Charles the Simple that they might become valuable allies. And thus the battle ended, as both sides began formulating the Treaty of Saint-Clair-sur-Epte.

In 1618 the Italian painter Padovanino painted a version of the event which now hangs in the Pinacoteca di Brera.

Rollo (Norman: Rou, Rollo(u)n; Old Norse: Hrólfr; French: Rollon; died between 928 and 933) was a Viking who became the first ruler of Normandy, today a region in northern France. He emerged as the outstanding warrior among the Norsemen who had secured a permanent foothold on Frankish soil in the valley of the lower Seine. After the Siege of Chartres in 911, Charles the Simple, the king of West Francia, granted them lands between the mouth of the Seine and what is now Rouen in exchange for Rollo agreeing to end his brigandage, swearing allegiance to him, religious conversion and a pledge to defend the Seine's estuary from Viking raiders.The name Rollo is first recorded as the leader of these Viking settlers in a charter of 918, and he continued to reign over the region of Normandy until at least 928. He was succeeded by his son William Longsword in the Duchy of Normandy that he had founded. The offspring of Rollo and his followers, through their intermingling with the indigenous Frankish and Gallo-Roman population of the lands they settled, became known as the "Normans". After the Norman conquest of England and their conquest of southern Italy and Sicily over the following two centuries, their descendants came to rule England, much of Ireland, Sicily and Antioch from the 11th to 13th centuries, leaving behind an enduring legacy in the histories of Europe and the Near East.