Battle of Saucourt-en-Vimeu: Louis III of France defeats the Vikings, an event celebrated in the poem Ludwigslied.

The Battle of Saucourt was part of the Viking invasions of West Francia and occurred between forces of Vikings and the troops of Kings of West Francia, Louis III of France and his brother Carloman II, on 3 August 881 at Saucourt-en-Vimeu.

Louis III was King of West Francia from 879 until his death in 882. Despite questions of his legitimacy and challenges against his ascendance to the monarchy, Louis would prove to be an effective leader during his reign, notable for the defeat of Viking invaders at the Battle of Saucourt-en-Vimeu in August 881 that would later be immortalized in the poem Ludwigslied. He also led a less successful military campaign against Boso of Provence with help from Charles the Fat.

Vikings were a seafaring people originally from Scandinavia, who from the late 8th to the late 11th centuries raided, pirated, traded, and settled throughout parts of Europe. They voyaged as far as the Mediterranean, North Africa, the Middle East, Greenland, and Vinland. In their countries of origin, and in some of the countries they raided and settled, this period of activity is popularly known as the Viking Age, and the term "Viking" also commonly includes the inhabitants of the Scandinavian homelands as a whole during the late 8th to the mid-11th centuries. The Vikings had a profound impact on the early medieval history of northern and Eastern Europe, including the political and social development of England and parts of France, and established the embryo of Russia in Kievan Rus'.

The Ludwigslied is an Old High German (OHG) poem of 59 rhyming couplets, celebrating the victory of the Frankish army, led by Louis III of France, over Danish (Viking) raiders at the Battle of Saucourt-en-Vimeu on 3 August 881.