Battle of Dürnkrut and Jedenspeigen
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The Battle on the Marchfeld (Morava Field) at Dürnkrut and Jedenspeigen took place on August 26, 1278 and was a decisive event for the history of Central Europe for the following centuries.
The opponents were Czech army led by king Ottokar II of Bohemia and an imperial Army led by Rudolf I of Habsburg in alliance with the Hungarian King Ladislaus IV of Hungary. The Hungarian Army included Hungarian heavy cavalry as well as Cuman horse archers.
The Marchfeld (named after the Morava river) northeast of Vienna became the battlefield, as the armies consisting of knights could easily engage in battle on the flat terrain with hardly any forest. It is estimated that almost 80,000 men (about 40,000 on each side) were involved. Thus, it was likely the largest battle fought among knights during the Middle Ages. The estimated number of Hungarians and Cumans was 20,000. On the other hand this battle is also a good example of the aligned usage of heavy cavalry and horse archers.
In the late afternoon, Rudolf's forces finally could decide the battle in their favor. Ottokar did not die in battle, but was murdered during the retreat. It is suspected that he was the victim of a Carinthian knight's personal vendetta.
The victory allowed the Habsburgs to take control over the Duchies of Austria, Styria, Carinthia and Carniola for the centuries to come (until 1918) and tostart growing into a serious power in German politics instead of being just a petty-princely caretaker administrator, while the Premyslid dynasty was somewhat prevented from expanding to west and to German-speaking lands and to effectively compete for the imperial crown, instead turning their main interests eastward to kingdoms of Poland and Hungary. Only some fifty years later did it become possible for kings of Bohemia (dynasty descended from Premyslids) to again have imperial designs in Germany. The heirs of the two protagonists united their dominions first time in 1438, and again in 1526, after which several monarchs ruled Vienna from Prague, but clearly a bigger number vice versa.
