Dutch–Hanseatic War vs Dano-Hanseatic War (1426–1435)

The League relied on economic warfare doctrine rather than military force. Holland, constrained by the limited naval flexibility of Burgundy's feudal army, could not adapt to the war's dynamics. The League's diplomatic flexibility brought long-term victory.

The Hanseatic League adapted its strategy throughout the war: combining blockade with coordinated land offensives, negotiating separate peaces (Rostock and Stralsund in 1430), and extracting concessions in the final peace. The Kalmar Union, however, could not adapt to internal revolts and collapsed.

Attrition War — The Hanseatic League pursued a strategy of attrition, targeting Dutch trade rather than seeking direct naval engagement. Holland attempted to strike at League ships through privateering but could not sustain pressure.

Attrition War — The strategy aimed to exhaust the enemy's will and resources through long-term economic blockade and intermittent engagements, rather than a decisive battle, ultimately leading to internal revolts and financial collapse of the Kalmar Union.

The League's center of gravity was the security of its trade fleet and control of its Baltic ports. Although Holland attempted to threaten this center, it could not break the blockade, and its own trade routes were cut. The League correctly identified Holland's center of gravity (economic dependency) and won the war.

The Hanseatic League correctly identified the center of gravity as the Øresund blockade and economic warfare, using the Schleswig-Holstein front as a supporting effort. The Kalmar Union dispersed its forces between the land and sea campaigns, failing to establish a center of gravity.

The League used diplomatic alliances with Denmark and other powers to narrow Holland's operational space, achieving superiority through diplomatic maneuvers rather than military deception. Holland's privateering strategy failed to surprise the League.

The Hanseatic League exploited the neutrality of Prussian and Livonian cities to diplomatically deceive Kalmar, while using privateers for unexpected coastal raids. Kalmar's attempt to support Lübeck rebels backfired and failed to divide the Hansa.

The Hanseatic trade embargo had a greater shock effect on Holland than any military attack. Although privateer raids damaged League ships, they did not cause a strategic collapse. The decisive blow was economic pressure.

The Hanseatic navy's sudden raids (Bornholm, Bergen) and the economic shock of the blockade kept the Kalmar Union off balance. Although the combined fleet won tactical victories like the 1427 Øresund battle, it failed to achieve strategic shock effect and ceded initiative to the Hansa.

The challenging weather conditions and narrow passages of the Baltic Sea favored the Hanseatic League, especially control of the Danish straits. Although the stormy North Sea gave Holland some home advantage, it was insufficient to break the blockade.

The geography of the Baltic Sea provided an ideal choke point (Øresund) for the Hanseatic blockade, while the Danish archipelago and Norwegian coast favored defense. However, the Hansa distracted Kalmar by raiding Bergen. Seasonal storms occasionally weakened the blockade, but the Hanseatic fleet generally maintained sea control.

The League, through intelligence from Baltic ports and merchants, had the advantage of knowing Dutch ship routes and numbers. This allowed them to deploy forces more effectively and monitor Dutch maritime traffic.

The Hanseatic League exploited its trade networks and inter-city communication to anticipate enemy intentions, whereas the Kalmar Union failed to exploit Hanseatic divisions (e.g., Prussian and Livonian neutrality) and underestimated Holstein's military capacity.

Neither side could effectively use interior lines. The League's fragmented structure hindered force concentration. Holland, despite Burgundy's land support, failed to enhance naval maneuverability and break the blockade.

The Hanseatic League utilized interior lines to conduct rapid land offensives through Holstein (e.g., capturing Flensburg) while maintaining constant naval pressure in the Øresund. The Kalmar Union, hampered by uprisings, could not shift forces swiftly and remained passive.

The League's commercial interests and the independent spirit of its cities boosted their resilience. Dutch privateers were motivated by plunder but morale declined as ducal support waned. The League's economic stamina provided a psychological advantage.

King Eric's authoritarian rule and the war's economic burden eroded popular support, sparking the Engelbrekt Rebellion in Sweden. In contrast, Hanseatic morale, despite some internal dissent, was sustained by the defense of commercial interests and profits from the blockade.

The Hanseatic League, instead of a large-scale naval campaign, applied economic sanctions and a trade embargo to compel Holland to negotiate. The blockade's damage to the Dutch economy forced them towards peace.

The Hanseatic League gained an early advantage by allying with the Count of Holstein and thwarting Eric's support for rebels in Lübeck, while the Kalmar Union's alliances with Poland and Holland remained insufficient to alter the war's course.