The French aggression in the Spanish Netherlands caused relations between France and Holland to deteriorate. The Dutch had already fought the Spanish for generations to protect against an invasion of their country. They had no intention of allowing the French to pose the same threat by occupying the territories on their border. The result was war in the Netherlands from 1672 to 1678, during which Louis again demonstrated the effectiveness of French might. In a sweeping campaign, Louis almost succeeded in conquering Holland. To protect themselves, the Dutch opened their dikes, flooded the countryside, and turned Amsterdam into a virtual island. Louis’s armies could not advance farther, and they began negotiating a truce. War resumed, however, when Spain and Austria allied themselves with Holland, and Louis signed a treaty with England in 1670 to keep the English navy neutral. Neither side could win a decisive victory, and both suffered from financial exhaustion, which ultimately led to a treaty to end the war. 