Brandenburg–Dutch Alliance

Timeline

1. 1672Brandenburg and the Rhineland · GermanyFrench forces invaded the Netherlands and advanced to the Rhine border, putting the Electorate of Brandenburg at risk of encirclement by French power. The Great Elector Frederick William had previously wavered between France and the Netherlands, but under the Dutch crisis and anti-French public pressure began secret talks with the States-General on a joint defense plan.
2. 1672The Hague · South HollandBrandenburg and the Netherlands formally signed an alliance treaty, agreeing that if one was attacked by France the other would provide military aid, with coordinated operations on the Rhine and in the Spanish Netherlands. The Netherlands reciprocated with financial subsidies and diplomatic support, and William III personally drove the negotiations, making the alliance a vital sign of hope for the United Provinces in the darkest hour of the Year of Disaster.
3. 1672–1674Westphalia and the Rhineland theater · GermanyBrandenburg forces tied down France and its Cologne allies on the Rhine–Westphalia front, easing pressure on the Dutch homeland. The alliance demonstrated a model of cooperation between German Protestant princes and the United Provinces, prompting more powers to join the anti-French coalition, undermining France's strategy of a quick victory and pushing the war into a prolonged stalemate.