How a detained princess and a bag of gold triggered a Prussian military invasion
In 1787, the arrest of a Prussian princess near a Dutch sluice gate sparked a swift, decisive invasion. Orchestrated by British money and Prussian steel, the campaign aimed to restore a stadtholder to power, crushing a democratic movement that had dared to challenge the established order of the Dutch Republic.
The conflict began when Wilhelmina of Prussia, wife of the Dutch Stadtholder William V, attempted to travel to The Hague in June 1787. Her journey was a calculated political maneuver, backed by the British envoy James Harris, intended to pressure the States of Holland. Patriot Free Corps intercepted her near Goejanverwellesluis, detaining her briefly before sending her back to Nijmegen. While the incident was largely bloodless, it provided the necessary diplomatic pretext for her brother, King Frederick William II of Prussia, to intervene.
Prussia’s motivations were initially limited to securing an apology, but the situation escalated as European powers maneuvered. Britain, eager to maintain the balance of power, funneled £70,000 into subverting Dutch politics, bribing officers and funding Orangist forces. Meanwhile, France—the Patriots' primary hope—was paralyzed by internal financial crises and a lack of clear leadership. By September 1787, with the Russo-Turkish War breaking out and British support assured, Frederick William II authorized a 20,000-man force under the Duke of Brunswick to invade.
The campaign was remarkably rapid. Brunswick’s troops crossed the border on 13 September 1787, moving in three columns. The Patriot defense, hampered by low morale and the desertion of mercenary troops, collapsed almost immediately. Utrecht was abandoned on 15 September, and the fortress city of Gorinchem surrendered after a token bombardment on 17 September. By the time the Patriots attempted to regroup in Amsterdam, the momentum had shifted entirely. The invasion successfully disarmed the Free Corps and reinstated William V, effectively ending the democratic experiment in the Dutch Republic.
Source: Prussian invasion of Holland
