# Torstensson's Jutland campaign

Torstensson's Jutland campaign (Swedish: Torstenssons fälttåg på Jutska halvön) occurred from 1643 to 1644 and began when Lennart Torstensson led 16,000 men into Holstein, later invading Jutland where he and Robert Douglas defeated a 1,400 strong cavalry force under Friedrich von Buchwald. Later, Torstensson had further success, capturing Kolding and later Snoghøj where thousands of Danish soldiers defected into Swedish service, while their commander fled over to the Danish with the rest of the forces.

## Background

In May 1643, Axel Oxenstierna, Sweden's Chancellor, had had enough of Danish disruption of Swedish activities, such as blockading Hamburg. It was also in response to reports of a Danish mobilization of the navy and army, and Danish emissaries had been agitating peasants on the border. Additionally, there were also reports of Danish negotiations with the Holy Roman Empire and planning an anti-Swedish coalition between it, the Polish–Lithuanian Commonwealth, and the Tsardom of Russia. Another issue were the Sound Dues, where Christian IV had been taxing Swedish export ships, despite the Swedish exemption as said by the old Treaty of Knäred.

### Swedish plan

In his plan, Oxenstierna wanted to neutralize the Danish threat to Sweden, and he outlined it according to the campaign strategy Gustavus Adolphus made in Stettin in 1630.
The plan has been noted by historians as being "well ahead of its time". In short, Torstensson would lead an attack through Germany, conquering Jutland and subsequently transporting his army over to the Danish islands, attacking Copenhagen once he had crossed all of them. At the same time, a corps of 2,200 men (2,000 infantry and 200 cavalry) under the command of Colonel Erik Hansson Ulfsparre would attack southern Zealand. Along with this, Field Marshal Gustav Horn would invade Scania, after which he would ship his troops over to Copenhagen and unite with Torstensson, forcing Christian IV to surrender. Along with this, envoys were also sent to the Netherlands to negotiate with Louis de Geer to send a fleet to Denmark to use as transport over to the Danish islands.
The Swedish plan was intended as a surprise attack, with one historian referring to it as a "true Blitzkrieg plan". However, the contemporary communication lines were not be quick enough for such planned coordination.

### Prelude

After receiving the order to attack Denmark in early October, Torstensson quickly prepared defences on the Bohemian and Moravian borders, and marched towards the north-west, refraining from informing his officers of their destination. The army Torstensson brought consisted of around 12,000 national troops, and adding the officers and underofficers, it had a total strength of around 16,000 experienced men. Along with the army, Torstensson brought with him three generals, Carl Gustaf Wrangel, Mortaigne de Potelles, and Arvid Wittenberg, each commanding their own column in the Swedish march. Torstensson's officers were only notified of his intention once arrived at Havelberg on 6 December, allowing him to take the Danes by surprise.
Swedish intelligence suggested that the garrison in Glückstadt had a strength of 500 men, while there was only 5,000 men in all of Holstein, Jutland, and the Danish islands combined. However, in reality, there was some 6,100 men in Jutland alone.

## Invasion

On 11 December, the Swedish cavalry was assembled at Ratzeburg, and on 13 December, Torstensson invaded Holstein, capturing Segelburg on the 14th, and soon after Itzehoe, Kiel, and Breitenburg. He successfully stormed the fortress of Christianpris (modern-day Friedrichsort) on 18 January 1644 after a valiant defense by Axel Urup. As a result of the storming, a large booty of valuables was taken and Holstein was occupied by Sweden. Since the Danes refused to surrender, Torstensson was ruthless and took no prisoners, leading to the Danes being terrified, with many nearby fortresses surrendering in exception to Krempe and Glückstadt. From these fortresses, several raiding groups were consistently sent out to harass the Swedes. Additionally, nobles abandoned their castles, and burghers their cities, choosing to escape into the fortifications or to the capital. The invasion came as a shock to Christian IV, however, the Swedes claimed they were only seeking winter quarters. Torstensson seemingly intended to collect ships in Kiel to use in a landing on Fyn. However, with the approaching cold, he abandoned the plan.
After war was confirmed, Christian quickly initiated recruitments. This expanded the Danish forces from only around 13,600 men to more than 26,000, placing these under the command of Anders Bille. Bille was ordered by Christian to assemble these troops in Snoghøj in order to stop the Swedish invasion as much as possible. In the battle of Kolding on 9 January, Torstensson encountered a 1,400 strong Danish free cavalry corps under Friedrich von Buchwald, with these being quickly dispersed by Robert Douglas. During the fighting, Buchwald himself was captured.
The remaining Danes fled into the nearby Snoghøj. After capturing Kolding, Torstensson moved against Snoghøj. The commander in the city, Anders Bille, realized that resistance would be useless, and evacuated everyone he could over to Fyn before the city capitulated. Those remaining, in exception to the peasant soldiers, joined Swedish service after Torstensson came up to the fortifications in battle formation.
Afterwards, the rest of the Danish Jutland army surrendered. By 20 January, most of Holstein and all of Jutland was in Swedish hands. Some peasants tried to resist the Swedish advance, but were dispersed or killed.

## Aftermath

After the successful invasion, Torstensson made attempts to cross over to Fyn, but these failed. The war eventually ended a year later with the Second Treaty of Brömesbro in 1645, where the stipulations included the cession of Jämtland, Härjedalen, Gotland, Ösel, and Halland to Sweden, and Denmark and thus been replaced by Sweden as the dominant power in the Baltic Sea.