During WWII the Dutch fought fiercly against the German occupiers. This happened in many ways.

Espionage

The resistance groups gathered information about the Germans in the Netherlands and elsewhere.  The goal of the espionage was to provide allied forces with information from within the occupied territories. 

Repatriation

It was important to to prevent the crews of shot-down allied aircrafts from falling into the hands of the Germans. Saving them and sending them to neutral countries was a job for the resistance. Activists and Jews were also saved in this manner.

Sabotage 

After the landing in Normandy and especially following the liberation of the southern part of the Netherlands in the fall of 1944 the resistance groups, under the leadership of Prince Bernhard, began to sabotage the railroads and other infrastructures. The goal was to limit the activities of the Germans. 

Killing of Germans and NSB'ers 

Members of the resistance carried out assasinations of Nazi agents and collaborateurs from the NSB.

Countermeasures by the Nazis

The German secret service was a strong weapon against the Dutch resistance. This service especially tried to arrest the leaders of the resistance groups. They also punished many innocent civialians. For example during a razzia in the village of Putten nearly all of the men were taken away and more than 550 of them were killed, after 2 members of the resistance had fired upon the car on the Nazis.