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System of Danish fortifications in Schleswig Holstein, Germany

The Danevirke or Danework (modern Danish spelling: Dannevirke; in Old Norse; Danavirki, in German; Danewerk, literally meaning earthwork of the Danes) is a system of Danish fortifications in Schleswig Holstein, Germany. This historically important linear defensive earthwork across the neck of the Cimbrian peninsula was initiated by the Danes in the Nordic Iron Age about AD 650. It was later expanded multiple times during Denmark's Viking Age and High Middle Ages. The Danevirke was last used for military purposes in 1864 during the Second War of Schleswig. The Danevirke consists of several walls, trenches and the Schlei Barrier. The walls stretch for 30 km, from the former Viking trade centre of Hedeby near Schleswig on the Baltic Sea coast in the east to the extensive marshlands in the west of the peninsula. One of the walls (named Østervolden), between the Schlei and Eckernförde inlets, defended the Schwansen peninsula. According to written sources, work on the Danevirke was started by the Danish King Gudfred in 808. Fearing an invasion by the Franks, who had conquered heathen Frisia over the previous 100 years and Old Saxony in 772 to 804, Godfred began work on an enormous structure to defend his realm, separating the Jutland peninsula from the northern extent of the Frankish empire. However, the Danes were also in conflict with the Saxons south of Hedeby during the Nordic Iron Age, and recent archaeological excavations have revealed that the Danevirke was initiated much earlier than King Gudfred's reign, at least as far back as 500 AD and probably well before that. Because of its historical importance and testimony to the defense of trade routes in the Viking Age, the Danevirke and the nearby Viking town of Hedeby were inscribed on the UNESCO World Heritage List in 2018.

Legend has it that Queen Thyra ordered the Danevirke to be built. She was the wife of the first historically recognized king of Denmark, Gorm the Old (reign c. 936 – c. 958). With the emergence of national states in Europe during the 1800s, the Danevirke became a powerful symbol for Denmark and for the idea of a unique Danish people and Danish culture. Throughout the nineteenth century, Denmark and Germany struggled politically and militarily for possession of the territory variously known as Sønderjylland or Slesvig by the Danes and Schleswig by the Germans. Two wars were fought, the First Schleswig War (1848–1851) and the Second Schleswig War (1864), eventually resulting in a Danish defeat and subsequent German annexation. In this hostile context, the Danevirke played an important role, at first as a mental cultural barrier against Germany, but soon also as a concrete military fortification, when it was strengthened with cannon emplacements and entrenchments in 1850 and again in 1861. Previous carbon 14 dating had dated some of the early constructions to the second half of the 7th century, and dendrochronology also suggests that the examined constructions began not very long after 737, about 70 years before the reign of king Gudfred.

The Danevirke is about long overall, with a height varying between During the Middle Ages, the structure was reinforced with palisades and masonry walls, and was used by Danish kings as a gathering point for Danish military excursions, including a series of crusader raids against the Slavs of the south Baltic. In particular, the 12th century King Valdemar the Great reinforced parts of the Danevirke with a brick wall, which enabled a continued military use of this strategically important structure. The reinforced parts of the structure are consequently known in Danish as Valdemarsmuren (lit: Valdemar's wall).

Danevirke 1 – Hovedvolden ("the main rampart"), Nordvolden ("the north rampart"), Østervolden ("the east rampart")The first Danevirke was built in five stages, starting about 650, according to carbon 14 dating. The first three stages were simple ramparts of soil, and the fourth stage was a palisade rampart with heavy timber front, built in 737. In the final stages the timber palisade was reinforced with a heavy stone wall around the timber. An armistice signed on 2 August 1848 caused the Prussians to evacuate Schleswig Holstein but did not end the war. Further engagements in the next two years saw fighting in the vicinity of the Danevirke but not directly involving it. Final peace was signed on 8 May 1852.

The last military use of the Danevirke was during the Second Schleswig War in 1864. Due especially to the above mentioned emotive nationalist symbolism, public opinion in Denmark and the Danish military had expected the coming battle to take place along the Danevirke. After centuries of abandonment and decay, the Danevirke fortifications were partially restored, strengthened, and equipped with artillery installations in 1850 and 1861. In the Second War of Schleswig, there was some early skirmishing to the south of the Danevirke, but no battle took place at it, as the Danish Commander in Chief, General de Meza, withdrew all soldiers to the trenches at Dybbøl, owing to an unexpected threat of being outflanked, as the Schlei and the wetlands between the Danevirke and Husum had frozen solid in a hard winter and could be crossed easily, and the territory immediately south of the Danevirke had been conquered by the advancing German army. This retreat came as a surprise to the Austro Prussian army, and almost all of the Danish army succeeded in completing the evacuation. It resulted, however, in the abandonment of important pieces of heavy artillery, and it remains a matter of historical debate why the railway to Flensburg was never properly used for the evacuation. News of the retreat came as a great shock to Danish public opinion which had considered the Danevirke to be impregnable, and General de Meza was promptly relieved of his command. The Danevirke has remained in German possession ever since.

Following the Allied invasion of Normandy during World War II, the Wehrmacht feared that a second Allied invasion might take place through Denmark, and contemplated converting the earthen wall into an anti tank trench to counter this threat. Had the proposal been implemented, it would have destroyed the structure. Hearing of the plans, Danish archaeologist Søren Telling – aware that all archaeological investigation was under the ultimate jurisdiction of SS chief Heinrich Himmler – immediately telephoned both the head of the SS's archaeological department, Amt für Ahnenerbe ("Office for ancestral heritage"), and Himmler himself. Telling argued strongly against the destruction of an important remnant of "Aryan civilization" and Himmler authorized him to stop the construction of the anti tank trench. He informed Telling that a written order would be dispatched but that it would take several days to arrive. Telling then drove to the site and ordered the commanding Wehrmacht officers to immediately stop the construction process. When the local Wehrmacht commander refused, Telling threatened him with reprisals from the SS. Construction was called off and Himmler's written order arrived two days later countering the Wehrmacht's original instructions. Telling later settled near the site and considered himself a custodian of it until his death in 1968.