Schleswig–Holstein Question
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The Schleswig–Holstein question (german: Schleswig-Holsteinische Frage; da, Spørgsmålet om Sønderjylland og Holsten) was a complex set of diplomatic and other issues arising in the 19th century from the relations of two duchies,
Schleswig The Duchy of Schleswig ( da, Hertugdømmet Slesvig; german: Herzogtum Schleswig; nds, Hartogdom Sleswig; frr, Härtochduum Slaswik) was a duchy in Southern Jutland () covering the area between about 60 km (35 miles) north and 70 km ...
() and
Holstein Holstein (; nds, label=Northern Low Saxon, Holsteen; da, Holsten; Latin and historical en, Holsatia, italic=yes) is the region between the rivers Elbe and Eider. It is the southern half of Schleswig-Holstein, the northernmost state of German ...
(), to the
Danish Danish may refer to: * Something of, from, or related to the country of Denmark People * A national or citizen of Denmark, also called a "Dane," see Demographics of Denmark * Culture of Denmark * Danish people or Danes, people with a Danish a ...
crown, to the
German Confederation The German Confederation (german: Deutscher Bund, ) was an association of 39 predominantly German-speaking sovereign states in Central Europe. It was created by the Congress of Vienna in 1815 as a replacement of the former Holy Roman Empire, w ...
, and to each other. The British statesman
Lord Palmerston Henry John Temple, 3rd Viscount Palmerston, (20 October 1784 – 18 October 1865) was a British statesman who was twice Prime Minister of the United Kingdom in the mid-19th century. Palmerston dominated British foreign policy during the period ...
is reported to have said: "Only three people have ever really understood the Schleswig-Holstein businessthe Prince Consort, who is deada German professor, who has gone madand I, who have forgotten all about it." Schleswig was part of
Denmark ) , song = ( en, "King Christian stood by the lofty mast") , song_type = National and royal anthem , image_map = EU-Denmark.svg , map_caption = , subdivision_type = Sovereign state , subdivision_name = Danish Realm, Kingdom of Denmark ...
during the
Viking Age The Viking Age () was the period during the Middle Ages when Norsemen known as Vikings undertook large-scale raiding, colonizing, conquest, and trading throughout Europe and reached North America. It followed the Migration Period and the Ger ...
, and became a Danish
duchy A duchy, also called a dukedom, is a Middle Ages, medieval country, territory, fiefdom, fief, or domain ruled by a duke or duchess, a ruler hierarchically second to the king or Queen regnant, queen in Western European tradition. There once exis ...
in the 12th century.
Denmark ) , song = ( en, "King Christian stood by the lofty mast") , song_type = National and royal anthem , image_map = EU-Denmark.svg , map_caption = , subdivision_type = Sovereign state , subdivision_name = Danish Realm, Kingdom of Denmark ...
repeatedly tried to reintegrate the Duchy of
Schleswig The Duchy of Schleswig ( da, Hertugdømmet Slesvig; german: Herzogtum Schleswig; nds, Hartogdom Sleswig; frr, Härtochduum Slaswik) was a duchy in Southern Jutland () covering the area between about 60 km (35 miles) north and 70 km ...
into the Danish kingdom. Holstein, just on the other side of the Danish border from Schleswig, was in medieval times a fief of the
Holy Roman Empire The Holy Roman Empire was a Polity, political entity in Western Europe, Western, Central Europe, Central, and Southern Europe that developed during the Early Middle Ages and continued until its Dissolution of the Holy Roman Empire, dissolution i ...
. From 1460 on, the two had been ruled together by a common Duke, who in practice was also the King of Denmark. The
Treaty of Ribe The Treaty of Ribe ( da, Ribe-brevet meaning The Ribe letter; german: Vertrag von Ripen) was a proclamation at Ribe made in 1460 by King Christian I of Denmark to a number of Holsatian nobles enabling himself to become Count of Holstein and gain co ...
, agreed to by the Danish King in order to gain control of both states, seemed to indicate that Schleswig and Holstein were to remain united, though that interpretation was later challenged. The Holy Roman Empire was dissolved in 1806. The German Confederation, formed in 1815, included Holstein. By the early 19th century, the population of Holstein, as well as that of much of Schleswig, was almost entirely ethnically German. Both Schleswig and Holstein had been ruled through institutions separate from the rest of the Danish Kingdom. On March 27, 1848,
Frederick VII of Denmark Frederick VII (Frederik Carl Christian; 6 October 1808 – 15 November 1863) was King of Denmark from 1848 to 1863. He was the last Danish monarch of the older Royal branch of the House of Oldenburg and the last king of Denmark to rule as an ...
announced to the people of Schleswig the
promulgation Promulgation is the formal proclamation or the declaration that a new statutory or administrative law is enacted after its final approval. In some jurisdictions, this additional step is necessary before the law can take effect. After a new law ...
of a liberal constitution under which the duchy, while preserving its local autonomy, would become an integral part of Denmark. This led to an open uprising by
Schleswig-Holstein Schleswig-Holstein (; da, Slesvig-Holsten; nds, Sleswig-Holsteen; frr, Slaswik-Holstiinj) is the northernmost of the 16 states of Germany, comprising most of the historical duchy of Holstein and the southern part of the former Duchy of Sch ...
's large German majority in support of independence from Denmark and of close association with the
German Confederation The German Confederation (german: Deutscher Bund, ) was an association of 39 predominantly German-speaking sovereign states in Central Europe. It was created by the Congress of Vienna in 1815 as a replacement of the former Holy Roman Empire, w ...
. The military intervention of the
Kingdom of Prussia The Kingdom of Prussia (german: Königreich Preußen, ) was a German kingdom that constituted the state of Prussia between 1701 and 1918.Marriott, J. A. R., and Charles Grant Robertson. ''The Evolution of Prussia, the Making of an Empire''. Re ...
supported the uprising: the
Prussian army The Royal Prussian Army (1701–1919, german: Königlich Preußische Armee) served as the army of the Kingdom of Prussia. It became vital to the development of Brandenburg-Prussia as a European power. The Prussian Army had its roots in the co ...
drove Denmark's troops from Schleswig and Holstein, beginning the
First Schleswig War The First Schleswig War (german: Schleswig-Holsteinischer Krieg) was a military conflict in southern Denmark and northern Germany rooted in the Schleswig-Holstein Question, contesting the issue of who should control the Duchies of Schleswig, ...
(1848–1851), which ended in a Danish victory at
Idstedt Idstedt ( ) is a village in Schleswig-Flensburg district in Schleswig-Holstein, Germany. It is c. 10 km. NNW of the city of Schleswig and east of the Bundesautobahn 7. On 24–25 July 1850, the Battle of Isted ended the First War of Schles ...
; with the London Protocol, the international community agreed on the duchies' status. A second crisis emerged due to a succession dispute. The dukedoms of Holstein and Lauenburg were legally inherited under the German Salic law which ignored females; differing laws in the Kingdom of Denmark with Schleswig permitted male heirs to inherit through a female line. Under these varying laws, the childless King
Frederick VII of Denmark Frederick VII (Frederik Carl Christian; 6 October 1808 – 15 November 1863) was King of Denmark from 1848 to 1863. He was the last Danish monarch of the older Royal branch of the House of Oldenburg and the last king of Denmark to rule as an ...
would have different heirs in Denmark and in Holstein. But when Frederick died in 1863, his Danish heir
Christian IX Christian IX (8 April 181829 January 1906) was King of Denmark from 1863 until his death in 1906. From 1863 to 1864, he was concurrently Duke of Schleswig, Holstein and Lauenburg. A younger son of Frederick William, Duke of Schleswig-Holstein ...
claimed to have inherited the Duchy of Holstein as well, and attempted to reintegrate the Duchy of Schleswig into the Danish kingdom by the signing the so-called November Constitution. This was seen as a violation of the London Protocol, and it led to the
Second Schleswig War The Second Schleswig War ( da, Krigen i 1864; german: Deutsch-Dänischer Krieg) also sometimes known as the Dano-Prussian War or Prusso-Danish War was the second military conflict over the Schleswig-Holstein Question of the nineteenth century. T ...
of 1864 and ultimately to the Duchies' absorption into Germany. Following the defeat of Germany in
World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
, the Danish-majority area of Northern Schleswig was finally unified with Denmark after two
plebiscites A referendum (plural: referendums or less commonly referenda) is a direct vote by the electorate on a proposal, law, or political issue. This is in contrast to an issue being voted on by a representative. This may result in the adoption of a ...
organised by the Allied powers. A small minority of ethnic Germans still lives in
North Schleswig Southern Jutland ( da, Sønderjylland; German: Südjütland) is the name for the region south of the Kongeå in Jutland, Denmark and north of the Eider (river) in Schleswig-Holstein, Germany. The region north of the Kongeå is called da, Nørr ...
, while a Danish minority remains in
South Schleswig Southern Schleswig (german: Südschleswig or ', da, Sydslesvig; frr, Söödslaswik) is the southern half of the former Duchy of Schleswig in Germany on the Jutland Peninsula. The geographical area today covers the large area between the Eide ...
.


Constitutional problem

Since 1849 disparate systems of government had co-existed within the Danish state. Denmark proper had become a
constitutional democracy Liberal democracy is the combination of a liberal political ideology that operates under an indirect democratic form of government. It is characterized by elections between multiple distinct political parties, a separation of powers into diff ...
. However, absolutism was still the system of Schleswig and Holstein, with advisory assemblies based on the estates system which gave more power to the most affluent members of society. The three units were governed by one cabinet, consisting of liberal ministers of Denmark who urged economic and social reforms, and conservative ministers from the Holstein nobility who opposed political reform. After the uprising in Holstein and Schleswig the monarch had no interest in sharing rule with the people, many formerly rebellious.
Estates of the realm The estates of the realm, or three estates, were the broad orders of social hierarchy used in Christendom (Christian Europe) from the Middle Ages to early modern Europe. Different systems for dividing society members into estates developed and ...
, with their fear of being replaced by democratic institutions, were easier to be compromised. This caused a deadlock for practical lawmaking, hardened by ethnic tensions, and a complete inability to govern was imminent. Moreover, Danish opponents of this so-called Unitary State (''Helstaten'') feared that Holstein's presence in the government and, at the same time, Holstein's membership of the German Confederation would lead to increased German interference with Holstein, or even into purely Danish affairs. In Copenhagen, the palace and most of the administration supported a strict adherence to the status quo. The same applied to foreign powers such as the United Kingdom, France and Russia, who would not accept a weakened Denmark in favour of a German power, such as Austria or Prussia, acquiring Holstein with the important naval harbour of
Kiel Kiel () is the capital and most populous city in the northern Germany, German state of Schleswig-Holstein, with a population of 246,243 (2021). Kiel lies approximately north of Hamburg. Due to its geographic location in the southeast of the J ...
or controlling the entrance to the Baltic.


Language and nationality

There was also the
national question ''National question'' is a term used for a variety of issues related to nationalism. It is seen especially often in socialist thought and doctrine. In socialism * ''Social Democracy and the National Question'' by Vladimir Medem in 1904 * ''So ...
: both Germany and Denmark wished, characteristically of the nineteenth century, to create and consolidate nationalities from a background of fragmented cultural practices and dialects. Lastly, there was the international question: the rival ambitions of the German powers involved, and beyond them the interests of other European states, notably that of the United Kingdom in preventing the rise of a German sea-power in the north. German had been the language of government in
Schleswig The Duchy of Schleswig ( da, Hertugdømmet Slesvig; german: Herzogtum Schleswig; nds, Hartogdom Sleswig; frr, Härtochduum Slaswik) was a duchy in Southern Jutland () covering the area between about 60 km (35 miles) north and 70 km ...
and
Holstein Holstein (; nds, label=Northern Low Saxon, Holsteen; da, Holsten; Latin and historical en, Holsatia, italic=yes) is the region between the rivers Elbe and Eider. It is the southern half of Schleswig-Holstein, the northernmost state of German ...
, while the Danish king and partly the Gottorf dukes ruled, and had been a language of government of the kingdom of Denmark in several eras. Since the Lutheran
Reformation The Reformation (alternatively named the Protestant Reformation or the European Reformation) was a major movement within Western Christianity in 16th-century Europe that posed a religious and political challenge to the Catholic Church and in ...
, German had been dominant in church and schools in the southern parts of Schleswig, and Danish was the dominant language among the peasantry in Schleswig.
Low German : : : : : (70,000) (30,000) (8,000) , familycolor = Indo-European , fam2 = Germanic , fam3 = West Germanic , fam4 = North Sea Germanic , ancestor = Old Saxon , ancestor2 = Middle L ...
was the language of all of Holstein. During the centuries following the
Middle Ages In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire a ...
, Low German had come to dominate in Southern Schleswig, which had originally been predominantly Danish-speaking. The Danish language still dominated in Northern Schleswig. Around 1800, German and Danish were spoken in approximately equal proportions throughout what is now Central Schleswig. The German language had been slowly spreading at the expense of Danish in previous centuries: for example, Danish was still spoken on the peninsula of
Schwansen Swania (german: Schwansen, da, Svans or ''Svansø'', meaning "swan island/peninsula") is a peninsula in Schleswig-Holstein, Germany, protruding into the Baltic Sea. It is located between the Eckernförde Bay to the south and the Schlei (English ...
around 1780 (the last known use of Danish was in the villages near the Schlei), but then became extinct. The language border in the nineteenth century conformed approximately to the current border between Denmark and Germany . It was clear that Danish dominance in Schleswig was vulnerable and weakening. Through its vigorous economic activity, the ethnically German area to the south expanded its geographic domain. Linguistically
Low German : : : : : (70,000) (30,000) (8,000) , familycolor = Indo-European , fam2 = Germanic , fam3 = West Germanic , fam4 = North Sea Germanic , ancestor = Old Saxon , ancestor2 = Middle L ...
immigrants constantly arrived, and previously Danish-speaking families often came to find it convenient to change languages. The Low German language, rather than Danish, had become typical of Holstein and much of south Schleswig. One solution, which afterwards had the support of
Napoleon III Napoleon III (Charles Louis Napoléon Bonaparte; 20 April 18089 January 1873) was the first President of France (as Louis-Napoléon Bonaparte) from 1848 to 1852 and the last monarch of France as Emperor of the French from 1852 to 1870. A nephew ...
, would have been to partition Schleswig on the lines of nationality, assigning the Danish part to Denmark, the German to Holstein. This idea, which afterwards had supporters among both Danes and Germans, proved impracticable at the time owing to the intractable disposition of the majority on both sides. This solution was subsequently implemented by plebiscites in 1920 as a condition of the
Treaty of Versailles The Treaty of Versailles (french: Traité de Versailles; german: Versailler Vertrag, ) was the most important of the peace treaties of World War I. It ended the state of war between Germany and the Allied Powers. It was signed on 28 June ...
, and
Northern Schleswig South Jutland County (Danish: ''Sønderjyllands Amt'') is a former county (Danish: ''amt'') on the south-central portion of the Jutland Peninsula in southern Denmark. The county was formed on 1 April 1970, comprising the former counties of Aaben ...
was returned to Denmark.


Treaty of Ribe

German Schleswig-Holsteiners often cited a clause from the
Treaty of Ribe The Treaty of Ribe ( da, Ribe-brevet meaning The Ribe letter; german: Vertrag von Ripen) was a proclamation at Ribe made in 1460 by King Christian I of Denmark to a number of Holsatian nobles enabling himself to become Count of Holstein and gain co ...
of 1460, stating that Schleswig and Holstein should "always be together and never partitioned (''or'' separated)". Although this treaty played a minor role at the more formal level of the conflict, its proclamation "Forever Inseparable" (''Up ewig ungedeelt'') obtained proverbial status during the German nationalist awakening, both among those wishing an independent Schleswig-Holstein, and in the
German unification The unification of Germany (, ) was the process of building the modern German nation state with federal features based on the concept of Lesser Germany (one without multinational Austria), which commenced on 18 August 1866 with adoption of t ...
movement in general. In Denmark it was granted less significance, and the citing widely regarded to be out of context, as it could either hint at the duchies not being separated from each other, or their not being partitioned into smaller shares of inheritance. This had happened many times anyway, leaving a confusing pattern of feudal units. Danes also brought forward rulings of a Danish clerical court and a German Emperor, of 1424 and 1421 respectively, stating that Schleswig rightfully belonged to Denmark, because it was a Danish
fief A fief (; la, feudum) was a central element in medieval contracts based on feudal law. It consisted of a form of property holding or other rights granted by an Lord, overlord to a vassal, who held it in fealty or "in fee" in return for a for ...
and Holstein was a fief of the Holy Roman Empire, wanting Schleswig and Holstein to separate from each other. The major powers appear to have given the Treaty of Ribe little notice in comparison to the ethnic conflict and worries about the European balance of power.


Resolution

The
Second Schleswig War The Second Schleswig War ( da, Krigen i 1864; german: Deutsch-Dänischer Krieg) also sometimes known as the Dano-Prussian War or Prusso-Danish War was the second military conflict over the Schleswig-Holstein Question of the nineteenth century. T ...
resolved the Schleswig–Holstein Question violently, by forcing the king of Denmark to renounce (on 1 August 1864) all his rights in the duchies in favour of Emperor Franz Joseph I of Austria and King William I of Prussia. By Article XIX of the definitive Treaty of Vienna signed on October 30, 1864, a period of six years was allowed during which the inhabitants of the duchies might opt for Danish nationality and transfer themselves and their goods to Denmark; and the rights pertaining to birth in the provinces were guaranteed to all, whether in the kingdom or the duchies, who had been entitled to those rights at the time of the exchange of ratifications of the treaty. In the Austro–Prussian War of 1866, Prussia took Holstein from Austria and the two duchies subsequently merged into the
Province of Schleswig-Holstein The Province of Schleswig-Holstein (german: Provinz Schleswig-Holstein ) was a province of the Kingdom of Prussia (subsequently the Free State of Prussia after 1918) from 1868 to 1946. History It was created from the Duchies of Schleswig and H ...
. From this point on, the Schleswig–Holstein question was subsumed by the larger issue of Austro-Prussian relations, which the 1866 war deeply influenced. It survived, however, as between Danes and Germans, though narrowed to the question of the fate of the Danish population of Schleswig. This question is of great interest to students of international law and as illustrating the practical problems involved in asserting the modern principle of
nationality Nationality is a legal identification of a person in international law, establishing the person as a subject, a ''national'', of a sovereign state. It affords the state jurisdiction over the person and affords the person the protection of the ...
. For the effect on the Danes of Schleswig and events afterwards, see
History of Schleswig-Holstein The history of Schleswig-Holstein consists of the corpus of facts since the pre-history times until the modern establishing of the Schleswig-Holstein state. Early history The Jutland Peninsula is a peninsula in Northern Europe with modern-day ...
. Following the defeat of Germany in World War I, the Allied powers organised two plebiscites in Northern and Central Schleswig on 10 February and 14 March 1920, respectively. In Northern Schleswig 75% voted for reunification with Denmark and 25% for remaining in Germany. It became
South Jutland County South Jutland County (Danish: ''Sønderjyllands Amt'') is a former county (Danish: ''amt'') on the south-central portion of the Jutland Peninsula in southern Denmark. The county was formed on 1 April 1970, comprising the former counties of Aaben ...
in Denmark, now part of the
Region of Southern Denmark The Region of Southern Denmark ( da, Region Syddanmark, ; german: Region Süddänemark, ; frr, Regiuun Syddanmark) is an administrative Regions of Denmark, region of Denmark established on Monday 1 January 2007 as part of the 2007 Danish Munici ...
. In Central Schleswig the situation was reversed with 80% voting for Germany and 20% for Denmark. No vote ever took place in the southern third of Schleswig or in Holstein, as the result was considered a foregone conclusion. Today, they form the German state of
Schleswig-Holstein Schleswig-Holstein (; da, Slesvig-Holsten; nds, Sleswig-Holsteen; frr, Slaswik-Holstiinj) is the northernmost of the 16 states of Germany, comprising most of the historical duchy of Holstein and the southern part of the former Duchy of Sch ...
.


Literature

Elements of the Schleswig–Holstein question were fictionalised in ''
Royal Flash ''Royal Flash'' is a 1970 novel by George MacDonald Fraser. It is the second of the Flashman novels. It was made into the film ''Royal Flash'' in 1975 and remains the only Flashman novel to be filmed. Plot summary ''Royal Flash'' is set during ...
'', the second of
George MacDonald Fraser George MacDonald Fraser (2 April 1925 – 2 January 2008) was a British author and screenwriter. He is best known for a series of works that featured the character Flashman. Biography Fraser was born to Scottish parents in Carlisle, England, ...
's ''
The Flashman Papers ''The Flashman Papers'' is a series of novels and shorter stories written by George MacDonald Fraser, the first of which was published in 1969. The books centre on the exploits of the fictional protagonist Harry Flashman. He is a cowardly Bri ...
'' novels. Its potential solution (or lack thereof) also forms part of the solution to the mystery at the centre of
Kim Newman Kim James Newman (born 31 July 1959) is an English journalist, film critic and fiction writer. Recurring interests visible in his work include film history and horror fiction—both of which he attributes to seeing Tod Browning's ''Dracula (1931 ...
's short story "Tomorrow Town". Danish author
Herman Bang Herman Joachim Bang (20 April 1857 – 29 January 1912) was a Danish journalist and author, one of the men of the Modern Breakthrough. Biography Bang was born in Asserballe, on the small Danish island of Als, the son of a South Jutlandic vicar ...
wrote of life on the island of
Als Amyotrophic lateral sclerosis (ALS), also known as motor neuron disease (MND) or Lou Gehrig's disease, is a neurodegenerative disease that results in the progressive loss of motor neurons that control voluntary muscles. ALS is the most com ...
in the aftermath of the
Battle of Dybbøl The Battle of Dybbøl ( da, Slaget ved Dybbøl; german: Erstürmung der Düppeler Schanzen) was the key battle of the Second Schleswig War, fought between Denmark and Prussia. The battle was fought on the morning of 18 April 1864, following ...
in the
Second War of Schleswig The Second Schleswig War ( da, Krigen i 1864; german: Deutsch-Dänischer Krieg) also sometimes known as the Dano-Prussian War or Prusso-Danish War was the second military conflict over the Schleswig-Holstein Question of the nineteenth century. T ...
in his novel ''Tine'', published in 1889.
Dostoevsky Fyodor Mikhailovich Dostoevsky (, ; rus, Фёдор Михайлович Достоевский, Fyódor Mikháylovich Dostoyévskiy, p=ˈfʲɵdər mʲɪˈxajləvʲɪdʑ dəstɐˈjefskʲɪj, a=ru-Dostoevsky.ogg, links=yes; 11 November 18219 ...
refers to this as "The farce in Schleswig–Holstein" in ''
Notes from Underground ''Notes from Underground'' ( pre-reform Russian: ; post-reform Russian: ; also translated as ''Notes from the Underground'' or ''Letters from the Underworld'') is a novella by Fyodor Dostoevsky, first published in the journal ''Epoch'' in 1864. ...
''. The question appears in the first volume of the ''Reminiscences'' of
Carl Schurz Carl Schurz (; March 2, 1829 – May 14, 1906) was a German revolutionary and an American statesman, journalist, and reformer. He immigrated to the United States after the German revolutions of 1848–1849 and became a prominent member of the new ...
Carl Schurz, ''Reminiscences'' (3 vols.), New York: McClure Publ. Co., 1907 as an issue of concern in the
Revolutions of 1848 The Revolutions of 1848, known in some countries as the Springtime of the Peoples or the Springtime of Nations, were a series of political upheavals throughout Europe starting in 1848. It remains the most widespread revolutionary wave in Europea ...
, and also as the farcical recollections of his friend
Adolf Strodtmann Adolf Heinrich Strodtmann (24 March 1829, in Flensburg – 17 March 1879, in Steglitz) was a German poet, journalist, translator and literary historian. He wrote an early biography of Heinrich Heine and emigrated to the United States for a time. ...
regarding Strodtmann's participation in the conflict (see Chapter 5, pp. 130–132, and Chapter 6, pp. 141–143).


See also

*
History of Schleswig-Holstein The history of Schleswig-Holstein consists of the corpus of facts since the pre-history times until the modern establishing of the Schleswig-Holstein state. Early history The Jutland Peninsula is a peninsula in Northern Europe with modern-day ...


References


Further reading

* * Müller, Friedrich Max
''The Schleswig–Holstein Question and Its Place in History''
in "Last Essays by the Right Hon. Professor F. Max Müller", 1881, (accessed on-line August 2017). * * Price, Arnold. "Schleswig–Holstein" in ''Encyclopedia of 1848 Revolutions'' (2005

* Sandiford, Keith AP. ''Great Britain and the Schleswig–Holstein question, 1848-64: a study in diplomacy, politics, and public opinion'' (University of Toronto Press, 1975). * Steefel, Lawrence D. ''The Schleswig–Holstein Question. 1863-1864'' (Harvard U.P. 1923). * Thaler, Peter. ''Of Mind and Matter: The Duality of National Identity in the German-Danish Borderlands'' (West Lafayette: Purdue University Press, 2009). Schleswig Wars National questions Denmark–Germany relations Duchy of Schleswig {{DEFAULTSORT:Schleswig-Holstein question