 Complete the following phrase:  The Battle of Bov was the first significant conflict of the First Schleswig War which was essentially a separatist rebellion by Schleswig and Holstein, territories which formed the southern part of the Danish kingdom but which also had increasing links to Germany, intensified by migration pressures and a shifting language frontier. To the south Holstein had also, till its abolition in 1806, formed part of the Holy Roman Empire, and now combined its ties to the Danish crown with membership of the German Confederation. In a century of rising nationalism the tensions this situation created could only increase, and the rebellion took on the character of an international war when Prussia intervened on behalf of the separatists. By 