1426 – 1429 (I): Baltic War (I)
The Baltic War did not begin as a religious or socio-political conflict. It resulted from a collision of interests: Erik of Pomerania, King of Denmark, Sweden and Norway, wanted to consolidate and centralize his realms by asserting its control over Baltic trade flows and gaining a steady source of royal income. To this end, Erik had begun to expand Krogen Castle, which oversaw the Øresund, in 1420. Once the Krogen was finished and outfitted with powerful cannons which threatened to sink any ship passing the sound, Erik began charging a fee from any foreign ship which passed the Øresund – the Sound Toll. This measure was primarily aimed against the Hanseatic League, to whose interests hegemony in the Baltic Sea was vital, and it provoked the predictable outcry.
Mixed into this conflict between the Hanse and the Kalmar King over the Sound Toll was a long-standing conflict between Schleswig and Holstein. The Danish King had pawned parts of the Schleswig duchy to the counts of Holstein-Rendsburg and wanted to ransom it now. When in 1426, negotiations about exemptions or a share in the revenues broke down. Danish ships began seizing Hanseatic ones, and the Hansa declared an embargo against Danish, Swedish and Norwegian ports, which it began to enforce through sea blockades. Simultaneously, Danish troops occupied Flensburg. Hamburg, Lübeck, Lüneburg, Wismar, Rostock, and Stralsund as well as the county of Holstein-Rendsburg were now at war with King Erik.
The Holstein-led land offensive was costly. Fearing for their traditional liberties in the context of a count of Rendsburg who squeezed his neighbouring lands out to the last drop for the war effort, representatives from the North Frisian localities gathered in St Nicolai on Föhr Island to write down the law of their land and its hitherto unwritten constitution (the Siebenhardenbeliebung). Costly though it was, it was only a limited success. Whilst most of the duchy of Schleswig fell under Holstein control, the city of Flensburg withstood Heinrich IV.`s siege, until Danish troops were able to relieve it. In the ensuing battle, count Heinrich was killed. Hamburg`s mercenary troops withdrew after this setback.
On the sea, things did not go very well for the Hanseatic League, either, in 1426 and 1427. In the first major sea battle of the war, which took place in and near the Øresund, Lübeck`s ships, commanded by their mayor Tidemann Steen, were initially successful in their attacks against Swedish ships commanded by the storman Greger Magnusson, whom they even managed to capture. But then, Danish ships under the leadership of the Pomeranian duke Barnim VIII. drove Hamburg`s flotilla into shallow waters near Copenhagen. Wismar`s ships, commanded by mayors Johann Bantzkow and Hinrik van Haren, arrived too late, and Steen held Lübeck`s ships back – for unfathomable reasons – from relieving the Hamburgers. Hoyer was imprisoned by the Danes, who consequently captured the rest of the Hanseatic fleet, too.
The defeat in the Øresund in 1427 created a lot of heat in the Hanseatic towns. In Lübeck, Tidemann Steen was condemned to a prison sentence by the town council. In Wismar, though, it was an infuriated mob which lynched Hinrik van Haren. Claus Jesup, who had already led a crafters` revolt against the patrician hegemony in 1410 and had been forced to step down together with his alternative, guild-elected town council at King Sigismund`s behest in 1416, rode on this wave of public fury right back into mayoral office, where he claimed to reinstate the guild council (in fact he was staffing the town council with as many of his close allies as he could, both from patrician and guild backgrounds). Then, he had Johann Bantzkow condemned to death and executed.
Other towns were afflicted, too – not only by the costly defeat which the Hanseatic fleet had suffered in the Øresund, but also by the complete breakdown of Baltic Sea trade. Mutual embargoes had stopped German-Scandinavian trade already. Growing and increasingly state-sponsored piracy also sabotaged internal trade, too. The cities on the coast, whose livelihoods depended on export and import, suffered terribly. Small wonder, thus, that chaos broke out in Rostock, too, where the town council was also dissolved and replaced by a rebellious “Council of the Hundred”, who claimed to represent the broader urban populace, especially the craftsmen, who wielded some economic power, but were categorically excluded from political representation under Lübeck law. [1]
King Friedrich, who had still not managed to have Pope Martin V. crown him as Emperor due to Martin`s continuing loyalty to Hungary`s king and Germany`s dethroned emperor Sigismund of Luxemburg, placed both Wismar and Rostock under imperial ban.
Then, as both Schleswig, Hamburg, Lübeck, Stralsund and even the rebel government in Wismar – but not the one in Rostock – as well as the Kalmar kingdoms and their Pomeranian ally, Barnim, prepared for the next round of hostilities, things got from bad to worse in Friedrich´s view.
In spite of popular leanings towards pacifism at the grassroots level, the various hejtmans of the Bohemian Confederacy had pursued their respective competitive foreign policies, both aristocratic-patrician and democratic-egalitarian politicians seeking new allies abroad and attempting to export their revolution. By New Year`s 1427/28, the successes of the radicals were difficult to judge – while the conservative charm offensive had brought one prominent new ally into the broader Hussite fold:
It was, of all people, the Pomeranian duke Boguslaw IX. of Stolp / Slupce. The cousin of the Kalmar King Erik had long been in conflict with the bishop of Cammin, a protracted feud he had inherited from his father and which had earned him both papal and imperial bans. Hussite envoys had gone to great lengths to convince Boguslaw that it was all right to just raze the bishop`s fort to the ground and confiscate what he found in his treasure chambers (he would find nothing there as the bishopric had indebted itself badly to prepare against such an onslaught) and monasteries and replace the bishop with whomever he deemed more worthy, and that he could count on Bohemian and Silesian support in such an endeavor, should he promise to return the favor in case of an imperial attack on the spříseženstvo. As a signal of his pure convictions, Boguslaw was expected to stop any persecutions inflicted on the scattered but not insignificant communities of “Waldensians” (in all likelihood, they were followers of ideas as they were developed in Hussite Bohemia, but in 1427/8, the German public was incapable of conceiving of such a thing as German-speaking Hussites) in Pomerania.
Boguslaw kept his promise, and so did hejtman Otakar of Kostelec. Although he failed to obtain the support of the Assembly, he sent a small, but well-armed contingent nevertheless – a highly controversial move which met with massive criticism in Bohemia, but which was made possible by the sizable quantity of financial resources which had gathered in the confederal coffers resulting from its control over Kutná Hora, its mines and mint.
Boguslaw`s victory was swift and unambiguous. The Hussites had quickly gained another ally and entered a new stage. On the other hand, they were now bound by a pact with a small principality far away from their core lands, and they were drawn into a difficult conflict.
Boguslaw had no illusions about the precariousness of his position, especially after his cousin, King Erik of Denmark, Sweden and Norway, had distanced himself from the measures taken in the Slupce duchy. Boguslaw and his new advisors now sought to garner alliances with the rebel councils in Rostock and Wismar.
This was too much for Friedrich. He had intended for his grand anti-Hussite offensive to be launched against the heart of the revolution, i.e. against Bohemia, and he had intended to wait for at least another year, until the mercenaries and other imperial troops he was gathering would have been sufficiently well-versed with the new tactics he favoured. But now, the North seemed to demand his attention first. The damn Hussite virus had spread to the Baltic Sea, and who knew how fast it would spread West along the coast among these renegades! If one looked at it, the Empire`s entire coast appeared under threat: Pomerania was openly supporting the Scandinavian kingdoms in their attempt to keep German merchants out of the Øresund. The rebels in Rostock and Wismar were perhaps already negotiating some neutrality policies and mutual alliance with Boguslaw the Hussite. God forbade that these unruly peasants on the North Frisian harden, in Dithmarschen, and even in Eastern Frisia, where peasants had overthrown two local strongmen in consecutive years, should jump on the Hussite train, too.
No, this rebellion had to be nipped in the bud.
To be continued.
[1] So far, everything is entirely OTL. Butterflies begin from here.