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The Hessian War (), in its wider sense sometimes also called the Hessian Wars ( Hessenkriege), was a drawn out conflict that took place between 1567 and 1648, sometimes pursued through diplomatic means, sometimes by military force, between branches of the princely House of Hesse, particularly between the Landgraviate of Hesse-Cassel and the Landgraviate of Hesse-Darmstadt. It was triggered by a division of inheritance following the death of the last landgrave of all Hesse, Philip I in 1567.
The real conflict, which lasted almost 80 years and spanned three generations, escalated in the 1620s, when the line of Hesse-Marburg died out, and peaked after 1645 in the Hessian War proper. This open warfare began with the Siege of Marburg in 1645 and ended in April 1648 (but before the Treaty of Westphalia which was concluded later that year and ended the Thirty Years' War) with victory going to Hesse-Cassel. In the aftermath, Upper Hesse was divided and parts of its territory went to the now stronger Hesse-Cassel.
During the Thirty Years' War, Calvinist Hesse-Cassel joined the alliance between Protestant Swedish Empire and Catholic France, whilst despite its Lutheran beliefs, Hesse-Darmstadt, sided with the Emperor. In the course of the war, Hessian mercenaries fought both in the main Hessian lands as well as in Westphalia (Prince-Bishopric of Münster and Paderborn), in Upper Guelders, on the Lower Rhine (Electorate of Cologne), in the Duchy of Brunswick and other places.
This conflict should not be confused with the campaign by Landgrave Philip I of Hesse, supported by Prince-Elector John of Saxony against the two Franconian prince-bishoprics of Würzburg and Bamberg in 1528, which is also referred to as the "Hessian War".
When the Rheinfels line died out in 1583 Hessen-Rheinfels was divided amongst the three remaining brothers of Philip II.
There was initially a dispute over whether each of the two remaining lines of the family should receive exactly half the territory or whether it should be split according to the number of nephews in each case. Darmstadt would have benefited from the latter interpretation, because George of Hesse-Darmstadt had produced more sons (Louis, Philip (III) and Frederick) than William of Hesse-Cassel with just one heir, Maurice. Following an action for annulment by Hesse-Darmstadt, the matter was decided in favour of Hesse-Cassel by the Aulic Council ( Reichshofrat), and Hesse-Marburg was divided in half.
In 1605, the dispute over the Marburg inheritance flared up again after Landgrave Maurice of Hesse-Cassel, whose beliefs since his accession in 1592 increasingly moved towards the Calvinism of his wife, Juliane of Nassau-Siegen, enacted several Calvinist-oriented laws in his domain and in the same year, converted to Calvinism himself. In the wake of this, many Lutheran priests moved to Hesse-Darmstadt and the Lutheran theologians of the University of Marburg went to the gymnasium illustre in Giessen, which, in 1607 also achieved the status of a university. Because, Maurice, by his conversion to Calvinism had ended the Lutheran unity of Hesse-Marburg, he fell foul of the will of his uncle, thus forfeiting his claim to his portion of Hesse-Marburg in the view of Hesse-Darmstadt. Darmstadt was at this point in time neither politically nor militarily strong enough to be able to pursue its claim to the whole of Hesse-Marburg.
The gamble paid off in the medium term: in 1621 the imperial Field Marshal Ambrosio Spinola occupied the Wetterau. In reply, the commander of the Protestant army, Ernst von Mansfeld, counter-attacked the Darmstadt upper county on orders of Prince-Elector Frederick of the Palatinate. In doing so, he succeeded in taking Louis V of Hesse-Darmstadt and his son, John, prisoner. In exchange for the release of the hostages, he was given the fortress of Rüsselsheim.
During his withdrawal from Russelsheim, however, Mansfeld was defeated on 10 June 1622 in the battle on the Lorsch Heath by imperial general, Tilly. A few weeks earlier, on 27 April 1622 in the Battle of Mingolsheim, Mansfeld had triumphed against Tilly, but achieved no great advantage from his victory. In the meantime, Tilly had grown in strength following his victory at the Battle of Wimpfen on 6 May 1622. Tilly defeated Mansfeld on 20 June 1622, as well as Duke Christian of Brunswick-Wolfenbüttel in the Hessian region at Höchst am Main in the Battle of Höchst, as a result of which the Protestant side was significantly weakened. Tilly advanced again against Hesse-Cassel and occupied all of Lower Hesse as far as the city of Cassel. As a result, he enforced the Aulic Council's judgement of 11 April 1623, that the entire heritage of Hesse-Marburg (including all tax revenue from it, retroactively) should go to the Darmstadt line. Tilly also occupied several Lower Hessian offices as a security.
Even the former county of Katzenelenbogen was seized from Darmstadt. Landgrave Louis V died during the campaign. His son, George II, took over the reins of power in Darmstadt and continued the fight against Cassel.
Because of military defeats and abject government by Landgrave Maurice of Hesse-Cassel, the Lower Hess estates openly rebelled against him and forced his abdication in 1627. The House of Cassel also lost Hesse-Rotenburg (the so-called Rotenburger Quart) thanks to Maurice's division of his inheritance. Thus weakened, Maurice's son and heir, William V, was forced to accept the judgment of the Aulic Council in 1623 and cede the disputed territories. On 24 September 1627 a settlement was reached, the so-called Hauptakkord. The whole of Upper Hesse, the Lower County of Katzenelnbogen and the Barony of Schmalkalden, a Hessian exclave in Thuringia, went to Hesse-Darmstadt. In addition, Hesse-Cassel and Hesse-Darmstadt were granted the same level of precedence in the German Empire. In return, Hesse-Cassel was given back the territories in Lower Hesse that had been held as a security.
After the Edict of Restitution of 1629, Hesse-Cassel was also given the Imperial Abbey of Hersfeld, which had been under Lower Hessian rule since 1604.
With the political and military support of the Protestant alliance under the leadership of the Swedish king and thanks to the skillful leadership of William V, who himself went to war as a general, in the period that followed the Lower Hessian troops achieved considerable military success. As a start, they succeeded in driving the imperial occupiers out of Hesse-Cassel. On 24 August 1631, Hersfeld Abbey was conquered and, on 9 September 1631, the town of Fritzlar that belonged to the Electorate of Mainz. The imperial troops were further weakened by their defeat in the Battle of Breitenfeld and came under pressure. By mounting diversionary attacks on Mainz positions in the Taunus, Hesse-Cassel supported the Swedish advance on Erfurt, Würzburg and Hanau to Frankfurt and Mainz.
The hopes of Lower Hesse to recover their lost territories in Upper Hesse, as a reward for their support of Sweden, were not, however, fulfilled. After George II of Hesse-Darmstadt had concluded negotiations with the Swedish king, he succeeded in gaining recognition of the neutrality of Hesse-Darmstadt at the Treaty of Höchst on 29 November 1631, in exchange for giving up the fortress of Rüsselsheim, so that Darmstadt was able to keep its territories in Upper Hesse. Instead, on 28 February 1632, Gustavus Adolphus granted Hesse-Cassel several other areas outside of Hesse that the Lower Hessian troops had conquered earlier on Swedish orders (including the Fulda monastery, the Bishopric of Paderborn and Corvey Abbey) or intended to capture (the Bishopric of Münster, later substituted by the Swedish Chancellor Axel Oxenstierna for parts of the Duchy of Westphalia and Vest Recklinghausen).
In response to his victory over the imperial troops in Hanau and his alliance with France, William V of Hesse-Cassel was outlawed on 19 August 1636 by the Prince-elector at Regensburg. His adversary from Darmstadt was appointed administrator over all of Hesse. However, because of the military stalemate, the ban was initially ineffective.
Because even after more than two decades, no end to the confrontation was in sight and the whole of Hesse was suffering badly from the consequences of the war, more so than almost any other region in Germany, in February 1637 the Landstände, or knightly estates, from all parts of Hesse organized a Landtag to seek a mediation between their lords.
But this arbitration parliament was not successful because, in parallel, the newly elected Emperor Ferdinand III, also King of Croatia, had already sent several regiments of Croatian troops to Lower Hesse to the enforce the ban against William V. During their campaign the Croats devastated large parts of Lower Hesse and also threatened to take Cassel. In this situation, William V fled with his family and a large part of his army to East Frisia, where he was granted refuge by Ulrich II of East Frisia following mediation by the states-general. There, in the encampment at Leer, he died from disease on 21 September 1637.
In 1639, with her new allies behind her, Amalie Elisabeth's troops moved in greater strength against the Electorate of Cologne in order to defend the already conquered electoral territories (promised by Sweden in return for giving up Upper Hesse), especially in the area of Vest Recklinghausen, and to capture other domains besides. In 1641 Hesse-Cassel lost the town of Dorsten in Vest Recklinghausen, which they had seized in 1633, to troops of the Imperial Army and Electorate of Cologne after a siege lasting several weeks. This was the most important Hessian position on the right bank of Lower Rhine. But after the imperial forces partially withdrew to fight in other regions (especially Wolfenbüttel), Hesse-Kassel embarked on a campaign in the electoral lands on the left bank of the Rhine. At the Battle of Kempen Hesse-Cassel, with the support of French-Weimaran troops, dealt the Imperial forces a heavy defeat. In the wake of this defeat, large areas in the north of the Electorate, including the Duchy of Berg, and even parts of the neutral Duchy of Jülich fell under the occupation of Hesse-Cassel.
In 1647, an imperial army under the command of General Melander, who once stood in Cassel service until 1640, succeeded in recovering the town of Marburg - but not its castle. But because the town of Darmstadt and the Upper County was attacked in turn by French troops under the command of Marshal Turenne shortly thereafter, this success was short-lived. By the end of 1647, troops from Cassel had re-occupied the majority of Lower and Upper Hesse and the Lower County of Katzenelnbogen. In early 1648, Melander's troops withdrew from Marburg.
The Hessian War was finally permanently settled by negotiations, that took place in parallel with the Westphalian Peace Congress mediated by Duke Ernest of Saxe-Gotha and which resulted in a unification and peace treaty that was sealed in April 1648, ahead of the Treaty of Westphalia itself. Before the Westphalian Peace Treaty, Cassel fought one last time against the imperial side, winning the Battle of Wevelinghoven in the Rhineland, together with other Protestant troops. Darmstadt, however, was not involved in this battle.
Under the Unification Treaty between Cassel and Darmstadt, Upper Hesse was permanently divided. Darmstadt had to give up a significant part of Upper Hesse to Cassel, not least Marburg and other occupied territories, including the Lower County of Katzenelnbogen and the Barony of Schmalkalden.
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